Ok, where to start? Well, first of all, I finally got to listen to the amp FOR REAL. And I must say now that I have heard the ampness I can never go back.
I'll start with the bad points just to save the best for last. Let's see, what do I put here? Hmmmmmm... Oh yeah! One thing: Even with the gain on highest, I had to put my sound card master volume to max (this is considering I have the power-hungry hd600's), which made a slight hum, but no big deal. Um, that's about it.
Now for the good points.
The bass, man. I don't know how a small little box can improve the bass by, like, 10x, but it does. The impact and extension are great improvements from no amp. As for the treble, there is a very noticeable extension. The highs sound more clear.
And the crossfeed. Who can forget the crossfeed? The main thing about this is there is a much narrower soundstage, which is awesome compared to random instruments just flying all over the place. Each instrument is defined much more clearly, and there is more bass extension when the crossfeed is turned on. I love crossfeed.
The vocals are very much improved, also. Female voices sound more pleasant and soothing. SmOoTh.
Overall, this amp makes the music much more enjoyable. It livens up whatever you are listening to and makes it more musical
P.S. Just to let everyone know, I was comparing this amp to no amp at all. There was obviously a huge difference, and for those of you who don't have an amp, I demand that you buy one right this second (I also think that the Supreme is a good amp compared to many others, and think it is worth the price). In fact, if you don't, I'll come to your house, drive you to the hi-fi store, and force you to buy an amp while I hold a gun up to your head.