Boss DD-5 Digital Delay

Easy to use. Pretty intuitive. The hold mode is difficult to time properly (i.e. getting the right segment into the machine.

Very quiet. I have been playing with it for three weeks and haven't found all the possibilities yet. The wet-dry control and regeneration are very useful and continuous in their ranges. This pedal has some very short delay times (down to 1 microsecond) that are very useful for creating phase effects. Some very nice tone notches are possible in by using the short delay settings.

This sucker eats batteries. In fairness, the owners manual tells you that up front. They recommend buying a power supply, which I am going to do the next time I go to the music store. Other than that I haven't had any trouble.

I am glad I bought it. It turns out that it does stuff that I hadn't anticipated -- particularly the short delay effects. I almost bought a DD-3 but am glad I spent the extra twenty five bucks. Any momentary connect switch will work with the input for tap tempos, I think. The Boss momentary switch cost me an additional 21 dollars and I think I could have gotten away with a two dollar switch from Radio Shack. Other band members were blown away by the new sounds this item permitted.

Extremely easy to use, same great clarity as other Boss digital delays. The ease of use goes beyond setting it up to the real-time delay time setting. It's now super simple to get that delay going at just the right tempo even during a song.
"Hold" mode is tough to make useful. Minus one for that.

Not noisy at all. Has about 37 modes (really about 10) that do everything from regular manual delay settings (up to 2sec.) to that neat but not so useful looping-sample "hold" mode to a new "reverse delay" that is, um, interesting.
The only modes I use are the tempo tap modes. Just tapping on a momentary switch 4 times sets up the delay tempo without drop-out or glitches. And there's 1/4 note, 1/8 note, dotted 1/8 note and 1/4 triplet modes. A definite must for the live guitarist!

As reliable as every other Boss pedal (i.e. extremely).

Duno. Never had to deal with them.

Can't say enough about the niche it fills for live players. One less thing to bend over and adjust. About time Boss did this. Now, a couple good verbs on it would make it paradise!