Electro-Harmonix Holy Grail Reverb

You know the drill--one knob and one slider switch. They don't make pedals any easier to use.

beautiful, lush sounding reverb. both the spring and hall settings are VERY nice sounding and are definitely usable. the flurb is a definitely "effect" and not something i would use very much.

the problem, as has been noted many times in other reviews, is the noise. turn on the pedal and you get a very loud WOOOOOSH sound. i suppose that this noisefloor would be "acceptable" in a live gig setting where the "WOOOOOSH" would be covered up by drums, etc. But for practice and recording, it's totally unusable.

Unfortuantely, i bought it for recording......so it's going back.

I don't know. It's going back.

I've opened it up and there's not much in it......the case looks pretty cheaply made and the switch and jacks are cheap and not very well supported/reinforced, so i'm not sure it'd be up for the long haul.

Certainly it's not as "rugged" as a Boss pedal, which has always been my litmus for that sort of thing.

Never dealt with them.

Overall this pedal gets a 3. The reverb sounds great, but the noise makes it totally unusable for recording and practice (which is why i bought it).

great sound, as ehx says 'dick dale in a box'. i really like this pedal because its really simple and it has a very realistic reverb sound. one knob, three different modes(spring,hall,flerb. got the manual, sticker and everything. the manual says that the pedal is not to be used with any other adapters other than the ehx holy grail stock adapter, they say that something might break and the pedal wont work.

very, very realistic reverb. sound quality is qood, no hum when engaged. the spring setting can be anoying when the reverb knob is up all the way because there is a slight volume drop, and when the knob is up all the way on the hall setting, theres just too much reverb. the best is to set the knob at 12 or 1 oclock, thats when the reverb kicks in with no volume drop and such. the flerb setting is really cool, i use it a lot, especially with feedback, but you cant really hear it until its up to 3/4 of the knob or the whole way. what bothers me is that theres no reverse reverb function on it. i only had 90 euros, and i could either buy the digitech digiverb or this and i chose this because it wasnt too digital as the digiverb. i dont really mind not having the reverse reverb function, i'll get a special pedal for that in time... im using it through a Fender CIJ '06 Jazzmaster and a roland cube 15 amp, yeah i really have to switch this amp. maybe for an epiphone valve jr combo. i also use 4 other pedals, a big muff, a ds1(bad), a mxr blue box and a crybaby wah wah pedal. overall the sound of the holy grail is awesome through these.

yeah, i dont gig but i can depend on it, it's built like a tank.

never dealt with them....

i keep an open mind on music and i play noise/alternative,blues,surf and some funk. its perfect for all those, with my other pedals turned on it creates ear piecing feedback. i've been playing for 2 years. as i said my setup it Amp-Holy Grail-Big Muff-DS1-Blue Box-Crybaby-Fender Jazzmaster. i didnt compare it to any other reverb pedals, i thought of some different ones but i like this one the best (except the holier and holiest grails) i wanted to buy a phaser or a tremolo pedal, but i got this one since its most fun. as i said, i wish it would have a reverse reverb function. helps me with my sound, creates great feedback and echoes... i love ehx pedals, they are really good for the price and sound mind blowing.

It's as easy as it gets.... turn the knob for more......reverse the knob for less, as with all Electro-Harmonix effects it's a Musicians wet dream! Easy!

Spring Reverb in my opinion is the most overrated effect ever, I use vintage tweed amps that sound kick ass WITHOUT reverb, so when I add reverb I want it to be outboard, not permanently in my signal path 'messin with my tweed tone. This reverb is HANDS DOWN the best outboard, quick set up, add it when you need it reverb and I thank Electro-Harmonix profusely for making this sucker. Sounds magnificent! Flerb is so cool I can't imagine doing some of my tunes without it!

Two years of HEAVY use and no probs, but you have to use it's power supply, non electro-harmonix power supplys add noise. This is something that a lot of pedalboard users don't get because they try to use it with their pedalboards power supply. Does not not work, you have to use the power supply that comes with the pedal.

never had to use 'em.......

Unbelievable value! Spring reverb purists.....blah blah, yada, yada! I have sold so many so called "sought after" BLACK FACE FENDER REVERB amps over the years (at a large profit I might add) because of the lame signal path that spring reverb adds to an amp, only to retire to my studio to crank my tweed deluxe and occasionally add what I consider the best sounding reverb ever.... I don't want Holier, Holiest, Everso Holy! I want EASY, SOUNDS GREAT!

Very easy to use. it only has an on/off switch, a selection switch with 3 reverb choices and a mix knob. you can get dialed in very quickly.

The claim of this box is, and I quote from EH:

"The Holy Grail will make you a believer with its emulation of classic Spring reverb so faithful that even Dick Dale couldn't tell the difference"

Well, I own a spring tube reverb tank like Dick Dale and there is a big difference. I think The Holy Grail has a dark sound and the reverb tail is way too long. Since it does not have dwell and tone control you cannot adjust it. I can emulate the sound of the HG on my tube reverb unit by turning the dwell way up and the tone way down. That tone and dwell setting is fine for some things but not everything, but then again what can you expect for $89.99. But for the price I paid, it sounds fine. I have it on my pedal board and use it for one night stands, when I don't feel like bringing the tube reverb. I get used to it a few songs into the night

If you are looking for the true tube spring reverb sound, this is not it. If you are looking for an economical solution to a lack of reverb in your amp, this is fine. The question then should be: Is it worth the money? Yes, Its worth 89.99. The best thing about the newer units is that they are true bypass, so when it is off it does not color your sound at all. so when I use my tube reverb I don't have to unplug it from the pedal board.

I have only used it about a dozen gigs so far and it has never given me a problem

Have not had the pleasure

I play many different styles of music including surf music, Jazz, Rock, Pop, etc. I play an old strat through a custom made, point to point hand wired, Tweed Double Deluxe from SDG Vintage amps. He also made my tube reverb unit that is a replica of the old Fender.

No I would not buy another if this were lost or stolen. I would try something else

I'll give this a rating of 8 because it is so cheap. If I would have paid retail list price, $138.00, I would have rated it lower cause it is not worth that much

Does your guitar and amp sound good to begin with? If not this will not fix your shitty sound. If your guitar and amp sound good, this will make it sound much better. Unless you can afford an all tube vintage reverb unit for $1K+, you cannot complain about a $100 unit that sounds this great. If you still must, then buy a good combo with a high quality reverb and shut up, and realize it's limited too.... If you are running 5 gain stages, and need a good noise gate, then buy one...but don't blame the reverb for screwing up your sound. You probably had problems to begin with.

Sounds great on Spring, Hall, & Flerb. Spring is very warm and Fender like to mild slapback, Hall can go from subtle to a nice mild echo, and flerb is great for higher gain VH style or blues leads. You can get a subtle effect, a deeper effect, or lose your dry signal all together and warp it out. The Flerb sounds great in a mix, but not as well on it's own. Try it with several other instruments jamming though, and it can pick you up out of the mix quite well. Note that the drop in gain after 12 O'Clock is because you are only getting your sound with the reverb, and minus the dry signal. Those of you that don't like this unit, or complain because of that need to learn how to read a manual. Get a clue, don't blame your equipment for your ignorance.

Absolutely no problems. Now if you like to change effects with them powered on, or use bad power sources, or your amp and guitar hums normally, or you unplug your guitar while it's plugged into this, you probably damaged it yourself. This unit well will add effects to your trashy noise as well as good sounds. My amp and guitar are quiet, shielded, and sound good, and so does this. I have been using this for several months, and have had ZERO problems.

No problems, not an issue. Sounds like lots of folks have noise problems they like to blame on effects, rather than look at their buzzy amps, low quality cords, and unshielded guitars. Check out Tone Quest's review of this unit for the low down...

I play blues, jazz, fusion, funk, rock, punk, rockabilly, etc. This is a great all around reverb to use with both tube and solid state amplifiers that lack a reverb. Will it sound as good as a vintage Fender unit, probably not, but will a vintage Fender unit give you Hall and Flerb too for $100 or less? I have several low wattage tube amplifiers, and solid state units that lack a reverb. This is a great, cheap solution. If you make a living as a musician, well then maybe you need more than this, but for an amateur weekend jam player it is great. It doesn't sound digital either...unless you really push it...and it still sounds good to me then.

simple: one knob and one switch (spring, hall, flerb)

the sound is great.
my main reason for writing this review is to comment on the flerb. everyone seems to not think much of it, but i LOVE IT!
the spring and hall effects are great, but the flerb setting gives a cool slow flange to the spring reverb sound.
I use it a ton and nave even recorded with it and it sounds great!
it can adda really cool dimension...

usually mine works well.
every once and a while, it will hum loudly for no good reason, but then the next day sound normal again.
a few weeks ago it just stopped working. i messed around with it, and even took it apart to look for a loose joint. i didn't see anything wrong, and put it back together planning on buying a new one...but then it worked. and it has worked perfectly since...

never dealt with them..

nice pedal.
simple and fairly versatile for a straightforward reverb pedal.
i like it.


yes i'd buy another one. i'd thought about a holier or holiest grail, but i really love the simplicity of this one.

Just one knob and one switch. Pretty easy to get a good sound out of this box

The quality of effect itself is very good considering the price.
Spring and Hall I find very usable, Flurb is fun but not more than that. I used in front of a handbuild Tweed Twin and at first I found what I was looking for. But after a while......

....the problems started! Due to very poor quality of crucial parts the pedal started to hiss and sqirl. I found this problem in a lot of reviews on HS and people state that the pedal is very noisy. A little nuance on that: from the moment it starts to make noise, an op-amp has broken down, so in fact, your pedal has broken down and should be returned to the shop on a warranty basis.

Had two Holy Grails returned to shop I bought them from. On both occasions they were 'repaired' and after a while failed on me again. It doesn't really matter what kind of music one plays if your gear is not reliable. Whatever you play, it will always sound crap. It's a shame Electro Harmonics isn't prepaired to spend, say about, 5 dollars more on this one in order to make it more reliable. Bloody shame

Pretty easy to use, 1 knob, nice and simple.

I play a G&L ASAT Classic through a fender tweed clone. This thing is noisy as all hell. I would never even think of recording with it. The Spring reverb is weak, but the hall sounds cool. Thats what I use most of the time. The Flerb is a novelty, a kinda fun novelty, but a novelty none the less. Oh, and when you click this thing on it takes a little bit away from your tone. Not very much, but enough to aggravate me.

It works when it wants to work... Really have to baby it.

Maybe i'm just so hard on this thing cuz the I'm comparing it to the reverb on my Fender Deville, but overall I was not very pleased with this product. It's noisy, it's unrealible, and it eats my tone!!! RAWR!!!!! Maybe I will save up for a reverb unit...

Pretty easy to use, 1 knob, nice and simple.

I play a G&L ASAT Classic through a fender tweed clone. This thing is noisy as all hell. I would never even think of recording with it. The Spring reverb is weak, but the hall sounds cool. Thats what I use most of the time. The Flerb is a novelty, a kinda fun novelty, but a novelty none the less. Oh, and when you click this thing on it takes a little bit away from your tone. Not very much, but enough to aggravate me.

It works when it wants to work... Really have to baby it.

Maybe i'm just so hard on this thing cuz the I'm comparing it to the reverb on my Fender Deville, but overall I was not very pleased with this product. It's noisy, it's unrealible, and it eats my tone!!! RAWR!!!!! Maybe I will save up for a reverb unit...

Very simple: Switch to choose among 3 reverb setting, and 1 knob to adjust the volume/intensity of the effect.

Well, the reverbs actually sound very cool... MAJOR problem is the amount of noise and hiss from the pedal!! I tried it both at the end of my effects chain and in the fx loop - still noisy as hell. In fact, the noisiest pedal I ever owned. It's a shame.

It's an EHX... aluminum box looks nice, but easily scratched and dented.

Never tried to contact them.

I really wanted to like this pedal... but for me, it was unusable because it's too damn noisy. I gave up and returned it to the store.

The only downside is the no-standard power socket - but it's easy to swap out.

Hall and spring are just right for me. Flerb is fun but I'll never use it. Sound is OK - it doesn't suck tone. Problem is that it's just started hissing. It's been OK for 5 months but now the hiss is annoying. I play into a THD Bi-Valve. If I plug it straight into the amp then it's v. hissy. If I put it in the amp's effect loop then it's a lot less hissy - but still a bit annoying. I'll try returning it to the vendor. If it weren't for the hissing it would score 9

See above.

Fenders Mustang and modern USA Tele. Yam SG 2000 (70s). THD BiValve.

I won't buy another.

When you know what you want from a reverb ??
Very easy.
Set it at Hall, 9 - 10 o clock !!
Ready for anything !!

I have it since 5 years and it worked sometimes good and sometimes bad.
Sometimes it just dont want work, so I must put the adapter ( you need 500 mA. + 3,5 pin ) out and back again, sometimes I must repeat this 3 - 5 times, till it works. But than you can switch it on and off without any problem. Because my Plexi Amp has no reverb, I have buy that. Thinking that it give my some more "magic" because its called "holie grail", ( You know that "glory" Storys ). But at times I notice thats its not, I hold it the 5 years because, its better as nothing ;-) And a reverb is not the "importantsd" gear I need.
I have buy the new Engl souveraign 2x12 combo, with two seperate reverbs, so I dont need this anylonger.
I play since 20 years and have noticed that the best sound is coming from a good guitar, a goood amp ( with 2 channels + seperate reverbs ) and maybe a good Overdrive as Booster ( I use a maxon Ts9 ). And thats it, the more stombboxes you use, the more the main "natural" sound goes away. Also ( extrem ) with the Holie Grail.
I only used it at Hall, 9 - 10 O clock, sometimes, because the rest is f*** s****. What you eccept under a " Flurb" ?! You know !
I dont can say that its a tip, if you need a reverb ! Try something other out !!

Whats is wrong with EHX ??
It looks good but is build from cheap thin alu plates !
Turn in the guitar/amp cables, in and out can damege the box.
Stombing youre feet a littel bit to heavy on the on/off switch can destroy the cover !! Look inside the box and you understand why russian people drink wodka !! The paint job and the end manufacturing is made in the USA but the parts are made in UDSSR !

I dont speak russian and I dont know enough english "bad" words to contact them and say what I thing about them !
"WE ONLY HAVE THE DOLLAR SIGNS IN OUR EYES"

NO, NO, NO
I have spirit and magic in my soul and fingers.
I use Gibsons, Music Mans and Fenders.
I use Roccaforte and Engl Amps.
I play 50 - 100 gigs a year. Cover Stuff or own Music.
I play in studios.
I play since 20 years.
I had testet nearly anything that is popular in the guitar scene.
No, no, no.
This unit is s**** !!

Simple, and straightforward... Simple to get "GOOD SOUND"???

Sounds great till you turn your amp past "1". Then the noise takes over...

It is built cheap but I'm easy on stuff so it would probably last forever...

Didn't bother...

Holy Grail not so Holy...

--------------------------------------------------------------------------------

I bought one about a week ago (Holy Grail) at Guitar Center. I think the spring-reverb effect is pretty impressive. The other settings don't interest me. This would be a really cool piece of equipment but...

It produces a lot of hiss in my old amps (Stock BFPR/New Build 5E5A Pro clone). No, really, a LOT of hiss!!! (Think LOUDER than driving on the freeway with your windows down). There is a bit of squeal, or high pitched whine, that is pretty annoying too. It would be even more noticable but it is somewhat drowned out by the hiss. The switch makes a loud POP when you step on it. The box itself is microphonic, tap on it and you will hear it in the amp. Yes, I tried it with more than one amp, more than one guitar, wall wart plugged in to a separate circuit, different cables, even different tubes...

I read reviews here that some are better than others so I returned mine to GC and got another. EXACTLY THE SAME ISSUES! This one will go back too. UN-USEABLE...

Reading the reviews for the Holi-er Grail there doesn't seem to be the same problem with noise. I'm curious if it has the same spring-reverb effect, the one part about this pedal I like (I'd appreciate some feedback about this pedal). I don't need/want all the extra doo-dads but if that is what a guy has to do to escape the noise...

It's a joke. It also sucks that you have to use the power adapter that comes with it unless you have the newer Pedal Power.

This is an awesome, practical delay. And I emphasize practical. The guy below compares it to a Fender reverb unit. Obviously, the Fender dominates. But what practical, touring musician, would bring along his/her priceless, vintage Fender outboard reverb unit? I sure wouldn't. The Holy Grail is an awesome, simple reverb. The verbzilla and digiverb are cool, but if you want simplicity at it's best, go with the Holy Grail. Great sound and can do a pretty cool gated reverb a la Kevin Shields. My personal favorite is the Spring setting. I read about people having horrible noise issues. I A/B'd mine and didn't notice any noise problems.

I have mixed feelings about ehx boxes. I don't trust them, but nothing's happened to me and I've had mine for a 4 months. I'll probably rehouse the Holy Grail. I've heard people blowing out their Holy Grail because they use an insufficient power supply other than the one that comes with it.

Never dealt with them.

This is a very practical pedal. I recommend finding it used because I don't think it's a 100 dollar pedal. I traded a Boss RV-3 for this and I have noticed a greater improvement in my tonality. Definitely check it out and see if it suits you.

Using this is obvious, there's so few controls.

I won't bore you with a list of gear, other than to say I'm comparing this with a Fender 1963reissue stand-alone valve spring reverb, modded slightly to take it as close as possible to the original spec (6L6 not 6V6 valve, JAN NOS 12AX7s etc).

I was attracted by the advertising, which implies this pedal can make the same sounds as a Fender reverb, and because it looks less fragile than the Fender. I did wonder why the EHX website's sound samples don't include any surf guitar. Now I know. Dick Dale may or may not be able to tell the difference but I bloody well can. The Holy Grail is no substitute for the Fender unit. The Fender has pots that control dwell (basically the overall delay time/how hard the srings get twanged), mix (clean and fx signal) and tone (treble roll-off on the reverb signal only). These three controls interact in a very complex way, giving everything from a fearsome BOING with almost no reverb tails to swimming-with-head-under-water reverb wash. The tone control is very important in this as it has a huge impact on the reverb character, and the Holy Grail has no way of adjusting anything other than "level".

And if you kick it it doesn't go CRASHH-HH-HH-H-H-H-H either.

On the plus side it's a good copy of the single-control reverbs fitted into Fender amps, and when my hyper-active sax player trips over it it doesn't go CRASHH-HH-HH-H-H-H-H.

One thing to watch - all these reverbs that go before the amp sound best if the amp is set (relatively) clean. Ultra-long, compressed and distorted reverb tails are not pleasant (or even interesting).

I didn't notice whether the Holy Grail butchers your tone when its (supposedly) by-passed or not. My (limited) experience of EH stuff is that it probably does.

No idea about reliability. My EH fx are both from the 1970s and I've owned them both from new. Apart from having to redo/repair lousy soldering on most of the joints (dry joints, joints with mountains of solder, wires attached to the board/sockets by a couple of hairs) all I can say is that they keep working.

Would I buy one if it got stolen? I didn't buy the one I was trying out.

One Knop and a 3 styles switch its enough for a reveb, isnt it ?
Maybe a seperate Volumen...but no.

I have it on Hall and set the effekt at maximum 11 o clock,
this creates a reverb I can use everytime ( Its always on ).
Clean, chrunch, fat distortion...it gives my sound a good deepth and
warm note from the beginning.
Spring is not good enough and flerb its to psycedelic... unusuable, for me.
The more you have the big Knop turn clockwise the more bottom
looses your sound. So 12 is extrem church like.

My live Set up : Gibson Paula, Fender 66 Strat, ESP M II - Holy Grail - Digidelay - Fulltone 69 - Jekyll & Hyde red - Crybaby 353 - in a Marshall 1959 Plexi - 4 x 12 Vintage 30 or Mesa Lonestar 2 x12 Combo.

The way I set it, its maybe simple but it works.

Have it for 3 years always on my Board an sometimes the effect is not ther. so I must put the Adapter off and than put it back again.
BIG BULLSHIT .
but I can Live with that.

YOU NEED A 3,5 PIN CONVERTER. That is not the normal Visual Sound BOOS, Ibaneze switches !!!!

An It has 500 mA Thats very much,

?

A reverb is a must have for any Guitar player
This one is good, simple, sounding and its cheap !!
For me it works well .

This device couldn't be simpler to use. I even manage to tweak it with my toe.

What can I say? It's changed my life.. I use it with EVERYTHING- Electric and acoustic guitars, all manner of keyboards including a Mellotron and a Vox Continental- and it never fails to be transformative in some way. The hall setting is so realistic that I expected to hear the sound of the janitor kicking his mop-bucket over. I could happily have one built in to each of my keyboards. My amps are all reverbless Selmers and this thing is a GODSEND.
BUT... it's obviously not true bypass because you can still hear the sound of frying fish in the background if it's turned up yet switched out. That's a bit of a shame. I shouldn't have to change switches when they must cost sod-all to EH in the first place.
Still, it's quite inexpensive considering just how brilliant it is. You really must hear a Mellotron 8-voice choir through this- it's utterly fantastic. The 'Flerb' setting can be wonderful with combo organs too. It would be a 10 were it not for the noise when supposedly bypassed, otherwise thanks EH. I'll have your babies.

I have to depend on it. Occasionally it's refused to 'start' unless the AC adaptor is plugged into the Grail before the mains. I looked inside it once and just saw an enormous IC.
I'm quite a techie but if this died I think I'd be better off throwing it over the hedge than attempting to repair it.
Of course I'll use it without a backup. Life's too short!

Question. Why did the paint start falling off within days? It looked SOOO pretty for the first week...

Never had to.

I love this thing. As previously stated, I'm sure that I would tape one to every instrument I own. I play allsorts from batty electronica to prog-rock via light music and folky stuff.
It just sounds ACE with everything. I'd cry if somebody nicked it. Shame about the bypass but I suppose I'll just have to bodge it myself. Let's hope it survives! I don't really trust anything that depends on one huge IC to last long when it gets trodden on repeatedly..
Anyway, it's a jewel.

pretty easy - more or less one knob. But you have to be carefull with it's position. So watch out...;)

I like it turned pretty much all the way up in the hall mode. It`s a slightly distored endless reverb, bit shoegazish, bit velvet undergroundish. Really nice, and far away from the sterile clean boss reverbs.
I only use it for certain parts of songs.
I do not use the spring mode because I think it's rather boring and not really usefull for the music I play. Mabey for blues it`s fine.
Same with the flerb mode wich I find pretty stupid.
Unfortunatly it`s a noisy hissing bastard. But just turn it off while your not playing, that`s what the footswitch is for.

my setting:
epihone firebird-tu2-fulldrive2-ts808-holy grail-double muff-OCD-supa trem-dd20 delay-fender stage lead.

We all know that electro-harmonix pedals do not last long. I do not know why they`re sill built that way. They don`t seem to learn. Nice sound, but not reliable. Be carefull with it!

no idea

I play indie pop-rock.
The holy grail is pretty much the best reverb I know, if you want a dirty reverb.
But be sure that this is what you want. Otherwise, go for a boring boss, or even better: play without reverb!

3 settings and a level control. Doesn't get much easier than this.
Instant satisfaction.

I couldn't be happier. I LOVE it.
As I have a Fender Bassman (without internal reverb) I was looking for a simple stompbox that could give me some nice ambience.
Incredibly hard to believe that this is digital... It sounds SO warm and convincing! Makes you want to rattle the box to check if there's springs inside :-)
It has 3 different modes:
- SPRING: mimics an accutronics spring reverb, as found in most combo amps. very realistic. sounds best if used in small doses.
- HALL: sounds like you're playing in a cathedral. my favourite. I set it at about 2 o'clock, perfect for droning shoegazer-stuff or spooky jazz.
- FLERB: reverb with a touch of flanger on the decays. not very useful for me, but a cool feature anyhow.
The level control actually reacts as a "wet" control, so if you crank it, the overall volume of your sound will be lowered a bit. That's the only drawback of this pedal really. But I don't mind, because lately I tend to leave it on most of the time.
Make sure you buy the new version, as it has true bypass!

So far so good. But better watch out with EHX pedals... they're not the most sturdy. And that's already an understatement.

A little remark: when I used it the first few times it made a loud pop when I engaged the switch. Very annoying, because this makes it virtually useless for live or recording applications.
BUT! After some days the pop started to get gradually quieter and quieter. Now we're about a month further on, and the pop has disappeared *COMPLETELY*!!
So: once the footswitch has 'worn in' there's no more popping problem.

I play a lot of different stuff... mostly indierock (Pixies, The Smiths, Echo & The Bunnymen, Fischer-Z, The Sound), 70s/80s postpunk (Gang Of Four, The Chameleons, Joy Division), new wave (The Cure, Cocteau Twins, The Sisters Of Mercy), classic rock, bluesy licks,...
I mostly use this pedal in combination with my Fender USA Telecaster, a T-Rex Alberta overdrive, Boss SD2 dual overdrive, Boss CH1 chorus, Boss BF2 flanger (the early 80s japanese one), Ibanez DE7 delay/echo and my beloved Fender '59 Bassman Ltd Reissue.
It sounds fantastic. While other pedals may have more possibilities (eg. the Boss RV-series) the Holy Grail simply SOUNDS much better. Warmer, more organic, more natural. I'll say it again: when you hear this, you'll have a hard time believing this pedal is actually digital. It sounds THAT convincing.
Imho, it even sounds better than some "real" reverbtanks I have heard in certain amps.
Hell, this box even LOOKS cool!!!

This pedal is very simple, 3 settings and a knob to ajust the intensity. Didn't take me long to get it sounding good.

My Set-up: Fender American Deluxe Telecaster through a late '70s Hiwatt DR-504

There are two MAJOR problems with the sound of this pedal. For one, when turned off, it changes the tone of the guitar. And secondly, when turned on this pedal makes a buzzing sound in the background...

... two things which somehow I don't recall hearing when i tested it out at the store, I feel real dumb.

I've only had it for two days, and I allready want to get rid of it, so I can't really say anything on this. However, upond doing further research I have noticed that many people have complained about the reliability of this unit.

If you care about tone, DON'T BUY THIS.

Easy to use. Can't be much easier, but don't buy this pedal. Read further.

I like the sound and the options. Spring, Hall and Flerb - really cool. I use Gibson guitars and a Matchless amp. Not Noisy at all - sounds true. Don't buy this pedal.

HOLY CRAP - the thing is terrible. Don't buy it - I've had it for just over a month and it totally crapped out. The reverb knob became a volume knob - it fades out my guitar signal. What's up with that? 35 days is how long I've had it!!!!!! Total crap.

We'll see, I've written them about it, but we'll see... If they fix this situation, I'll update you guys. But, really, beware.

It's a switch and a knob. If you can breathe, you can handle it.

I prefer the 'flerb' function on this pedal because it produces a nice chorus/vibrato mix into the reverb. The spring reverb is decent but at extreme settings it gets harsh and metallic. Same goes for the 'hall' setting.

This pedal worked for 8 months and then mysteriously, the knob acted like a volume, instead of an effect knob. When turned clockwise, it simply turned down the volume of the signal and there was no reverb effect, whatsoever. I sent it for repair and they obliged curteously, but the pedal worked for only another 3 months before the same problem occurred. At this point I stomped this pedal into a concave worthless can.

See above.

I've owned lots of pedals from various manufacturers over the last 20 years of playing and this is the first time I've had such an experience- and not the Jimi Hendrix Experience. It's too bad, because overall it is a useful item, and I loved the flerb setting.

If you can't figure this thing out, just kill yourself now.

I'm playing more drums than guitar now so some sacrifices have been made and my rig is really simple (hardly a rig at all) - a Gibson Special SG or Fender Standard Strat into a Dunlop CryBaby and this thing, out through a Sovtek Mig 60/Vox AD412. I used to have a Crate combo with digital effects and I always thought reverb was a decent atmospheric effect. Clearly I knew nothing because this pedal adds another dimension to whatever you're playing. Oh, and "flerb" blows my mind, maaaan.

I'd say it's built like a friggin' tank.

No idea.

It's not a bad thing to have. If you can afford it, get it. If you can't, start saving.

I wish all pedals were like this - one switch, one knob. That is so cool.

The spring reverb that this thing produces is almost too good to believe -- far better than Boss and Digitech, which sound sterile and digital by comparison. However, these pedals are NOISY, or at least the 2 that I owned were. Both produced a very noticeable hiss which seemed to increase over the course of a playing session (using the correct EH power supply, and high quality Monster cables). What a disappointment, because again, the reverb is really stunning, save for the noise. This maybe a random defect, since some users report no problems, and I almost bought a 3rd unit hoping to get lucky. Ultimately, I opted for a Line 6 Verbzilla (very nice; very quiet).

I played mine regularly for over a year without any "other" problems, before finally getting fed up with the noise. The insides evidence quality components and good workmanship. However, the fact that so many reviewers describe the same problem as me, while others report no issues at all, suggests a serious lack of quality control.

Been playing classic rock and blues on and off since 1972. Too many amps and guitars to list. If you're lucky enough to have a relatively "quiet" HG, hang onto it, because there's no better sounding reverb pedal out there. If EH would whip the noise issue, this would be one of the coolest pedals ever! However, given my experience, I would not buy it again, or recommend it to others.

Piece of p**ss. Just one knob to dial in the amount of reverb, spring, hall and "flurb" plus footswitch.
Second hand but unused (its immaculate and came with all the original box candy :-) ) bought via Ebay.

Too much gear to list again.. see my MXR Dynacomp review for my list of gear.
I've replaced my Boss RV-5 with this little sucker and the difference in reverb quality is astounding. This blows the boss away. BY comparison the Boss is fizzy and thin. An awful tinny sound I could never get on with. The Holy grail just sounds so flippin good. You can cut out ALL of the dry signal if you like - you can't do THAT on the BOss and the GRail sounds warma nd very deep. Lovely and authentic. And at the price it is an absolute steal. I was a bit sceptical, but the EHX Holy Grail is brilliant.

Hiss? What hiss? I use an extensive array of quality pedals linked with quality leads into a quality amp fed by quality guitars. No hiss... Maybe I struck lucky and got a specially good one??

Only just had it...

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If you are looking for a reverb pedal try this one.