Tried the black one today. Great synergy with my Heir Audio 3.A. Loved the sound, menu seemed a tad laggy, but nothing I can't deal with. My only gripe is that fiddly volume knob. Seems like a manufacturing oversight.
If I didn't have travel commitments I would have immediately picked up the silver or gold set. Unfortunately, it'll have to wait. See you some time in the future AK100 club =(