I just got a couple of amps from Klaus. We basically started with a pair of Khartago’s and then spec’d them out to near reference level. So far I’m enjoying them. One is pushing a restored pair of Polk SDA 1C’s... the other I’m using to power my PMC TB2S+ near-fields. So far I’m very happy. Sound is right where I want it; neither too laid back nor too forward, but rich and detailed and a very fine image.