I'll chime in with a few thoughts on the V800, coupled with my HD800 and various amps. At first, it was pretty impressive. ecent soundstage for the price, nice blackground, neutral overal, w/ decent (not great) detail retrieval. Although technically it seemed like a bargain for the price, a couple of things annoyed me to the degree that I turned around and sold it within a couple of weeks. Namely, for lack of better teminology, I felt it had a 'hard' sound. Like how some headphones have 'hard treble', I felt the Violectric was 'hard' in all the frequencies. At first I couldn't understand why, and even after trying various inputs (USB,Coax, toslink)-I simply couldn't shake that hard sound. I think basically what was causing it was essentially most of the frequencies hit hard, with a lot of impact-but had improper decay. It also seemed like it was shouty at all registers-like it was saying 'LOOK HERE!' all the time, at anything and everything-trying to prove it's technical prowess, but at the cost of sounding hard, and at the expense of proper transient presentation. It was simply not an effortless sound-which is where I usually draw the line rather quickly.
I'll reiterate that these traits were unchanged regardless of input and amping used. Hope this helps.