after having had the amps a few months now, I think, I've found that they're extremely powerful, detailed and revealing. some of my cds now sound horrible, while the better ones sound even better. you just don't hear the guitar, you hear the finger strumming the string, that kind of deal. on the advice of another goner, I hooked up my old nht25i s to the amp, just for the hell of it. I was scared to do so, because the amp is 600wpc. he convinced me it was ok. so I did. ho-leeee-crap! that little nht opened up like you wouldn't believe. as far as on my genesis apm-1s, the sound is just unbelievable. huge-mongus. do yourself a favor and try one out. one last thing: I have to disagree with people who say class d sounds like tubes. they don't. not even close. but they are wonderful!!!! cheers. Jorge.