Sound: Rich, balanced, great tone. The only that really separates these from the great quality sound of something like a LCD-2 is the "closed" feeling to the sound. But, that's what you get when you wear closed-back headphones. If you need to have very minimal sound leakage to the area around you, then I would definitely recommend these headphones. Otherwise, get an open pair. I don't even find the open cans are really all that loud at normal listening volumes, although they can be like small desktop speakers when cranked all the way up.
Comfort: Good. No complaints. Not amazingly luxurious, but good.
Build Quality: Solid. They feel firm. Nothing is going to break.
Misc: They are powered well from anywhere....the m903, the Duet, my laptop, my phone, etc. It doesn't really affect them too much. They also come with a nice protective box and an ex