I have been enjoying the GamuT D-100 Mk3 for about 2 years and love it. I had the Pass Aleph 5 before it, but the GamuT is better. This amp is very natural, 3 dimensional, dynamic, and life like musical from top to bottom with plenty of power for my 88db 4ohm dynamic speakers (Chapman Q6) at real life volumes in a 25x15 room. The Mk2 is said to be less harmonically rich. Used Mk3s. sell for about 1600.