It's an OD stompbox in the purest Japanese tradition, used on guitars and synths, it makes both tube and solid state sounds shine, can't be compared directly with models from different ranges and/or giving different sounds.
A must have for classic rock and blues, it produces a soft, progressive drive, always accurate velvety sound.
The assorted reissue distortion is also a killer with high gains, harmonics flow out by themselves. On my shortlist for other sonic contexts.
Uses battery or a 9V supply, "reissue" format, pistachio green color that looks fine side by side with my two AD999 by the way.
Three very sensitive, progressive knobs, the OD works fine with my amp/pickup/volume setup.
THE SOUND: it's smooth, dense, homogeneous, creamy with a very efficient tone control.
Pros: reactivity, flawlessly built, simple to use, respects the incoming signal, true-bypass, designed to provide a very specific medium color, which is very much part of its appeal...
Cons: all ODs are known to eat out pat of the low end and this one is no exception, plus sometimes a little background noise at high level...