I, too, own Atma gear (MP-1, MA-1-stock).
We both know Ralph is a consummate stereo equipment designer.
So, for me, I have put my deposit on his new Class D amps.
The big question, as a Vandersteen owner, is the fact that it uses Feedback. Ask any Vandy diehard, and you'll know that amps with Zero Feedback work best for these speakers.
So, am going to give these a try, and also try to get my dealer to set up a demo comparing them to his Zero Feedbackamps, if possible.