Fantastic build quality, the sound quality is a step up from the old headset, I miss the easy accessibility of tapping on the side of headset and knowing that you muted your mic but the earphone mic mute button seems to work well enough.
The buttons are along the sides of the earpads, spaced out fairly evenly, the earpads "cup" your ears slightly so it feels natural once on your head, I wish there was a bit more padding on the top but it's not by any means a dealbreaker.
There is a new "mode" button on the right earpad, with the headset on you can switch it to multiple modes, "game, shooter, fighting, racing, movie, music."
At first I thought the bass impact was a bit gimmicky, but after playing with it at around 40% volume it does seem to make a difference, for example I played uncharted 3 and was able to "feel" each shot of my machine gun, so that was pretty awesome.
Oh, and you can have the phones turned off when you connect via the aux cable, it seems like it just uses the electricity of the device rather than the on-board battery.
If anyone has any questions let me know!