Hope nobody minds me bumping the thread, I don't feel it's entirely appropriate to make a new thread just for some quick impressions.
Got my V6's today. Really like them. Been putting them through their rounds, and I've come to the conclusion they are a minor upgrade to the XB700's, as well as a side-step.
Definitely have more detailed sound. "Heard stuff I've never heard", etc. I actually thought the XB700's were pretty detailed as they were, compared to all the other phones I've heard, but these are definitely better in that regard.
On the bass side, sure there's less of it, but again, it's more detailed. And it's punchier. The XB700's are pretty punchy, but the V6's beat them out. They just don't handle cranking the bass up to insane levels, but that's to be expected. Still, they hold their own with overall bass. Probably 80% the bass the XB700's have with my typical listening habits, so it's really not a problem.
The isolation is great. I was a little worried, because headroom says the XB700's had better isolation, and I thought there was no way that could be true. Thankfully I was right. They really do block out a lot of sound, and when music is playing I can't hear anything else.
One minor problem I have with the sound is the sibilance, especially at high volumes. It's as if somebody cranked up the treble way too high. The XB700's are much smoother by comparison. Can I expect the sibilance to mellow out a bit with burn-in?
On the non-sound side of these, I really don't have a problem. Lots of clamping force, but it's never so bad that it kills my ears. The cable is really heavy, like, heavier than the headphones themselves, but again, not really a problem. And it's nice to have a cable long enough to pass the headphones to my friend for a listen. Heh.