ADK SC-I

I've been an acoustic fingerstyle guitarist and amateur recording engineer for over 30 years, recording classical, rock/pop, and folk music, both live and in the studio. I currently record in Cubase on a laptop computer, using a Presonus Firepod interface. For monitoring I use Ultrasone Proline-650 headphones and Adam A-7 active monitor speakers. I own a collection of small and large condenser microphones, including Neumann KM 183, Audio Technica AT 3031 and 3032, AKG C-414, and ADK A-51.
I bought the ADK SC-1 several years ago as part of a Twin Pack for a price of 199$ (SC-1 small condenser, A-51 large condenser, 2 cables).

The ADK SC-1 is a small diaphragm condenser mic with a wide cardioid polar pattern. It has no switches and looks quite basic. The quality is appropriate and I never had any problems with it.
Among all my microphones, although being the cheapest by far, this is my clear favourite for recording solo fingerstyle steel string guitar (Taylor 512, Alhambra J-2), and just for that. But it does it so extremely well! I favour a full, balanced and melodious tone with nice airy harmonics, and the SC-1 delivers. It is not a flat or neutral sounding mic, and contrary to another reviewer, my tests show a rather poor transient response, compared to the AT 3031. But that potential weakness is irrelevant in the given context and could even help to take out some of the harshness of a bright sounding steel string.
An improvised relative spectrum analysis gives further evidence of my subjective impressions. It shows a slight frequency bump in the 300 to 600 Hz range, which enhances the body of the sound, a slight peak around 4 KHz, and more marked peaks at 8 KHz and above, adding freshness and air.
In short: Incredible value when it comes to recording solo acoustic steel string guitar. I didn't try it on anything else, but would expect excellent results on Mandolin or Piano as well.

I've been recording, semi-professionally, for about 25 years and playing music for about 35.
I own several mics in the $300-$500 dollar price range, and several in the $150-$200 range.
Large diameter condensers, tube, ribbon, an assortment of dynamics - but no small diameter condensers. (Well, other than some old Radio Shack models from the late '70s and early '80s from when I first started getting equipment.)
I wanted to see what kind of low budget deal I could find on some small diameter condensers. Looked at AKG C-1000s, Shure SM-81's, MXL 603s and 604s, Joe Meeks. .... And then I saw the the ADK SC-1s. I only found one review of them - in Tape-Op magazine (which is a great resource for people interested in recording/ engineering/ producing) - and it was favorable. ADK has a good reputation on their higher priced mics, so I decided to take a chance.

The ADK SC-1 is a fixed cardiod polar pattern small diameter condenser, requires phantom power. No frills - no on/off switch, no pad or roll off switches.
I've used them on acoustic guitar, male vocal, and a variety of percussion. It sounds very good on guitar, even better on percussion, and certainly useable for vocal. Typical of a small diameter condenser, it handles transients really well. I had some overs on an acoustic guitar track that sounded fine on play back. Set up as a pair, with one aimed at the fret board and the other above the guitar, I was able to blend the sound as thick or thin as I wanted. (Of course exact placement will determine the bass/treble balance.)
As nicely as it handles transients and spikes, it doesn't do well with plosives. It worked fine on vocal at a distance of two feet or more, but it can't handle close up wind.
Percussion may be the strong point of this mic. It saounded really good on everything I threw at it. Shakers, tambourine, congas, low open tones and sharp attacks. The stereo imaging and detail with a pair of the SC-1s was very nice.
It's labeled as a cardiod polar pattern - I'm sure that it is, but it's a pretty mild drop off at the sides and back, not extremely directional. Depending on your useage this might be a slightly negative characteristic. For me it was neutral. On the plus side the off axis sound stays natural and even all the way around the mic.
This is a good mic - "for the money" - as they always say. I don't know how well it would compete with a high dollar SD condenser, but judged on it's own merit and value I would recommend it. In a home studio market filled with more low cost large diameter condensers than you can keep track of, this mic is a different option, a useful, good sounding tool.