Finally got them and I am very happy with them.
Mind you I have only played COD4 with them atm. It is good to hear the game and people sneaking around as well as being able to talk.
It took a bit to set up but finally figured it out. I have the HDMI cable so had to go back to the box to get the extra audio plug that was included and lucky I had some red and white audio cables lying around. (would need those if wasn't using HDMI)
As far as headphones, I think they are on par with others that I use for the stereo etc, however I would say they have more depth and seem to be able to play much louder. Pretty sure I am hearing things in game that I couldn't before, especially distant sounds. After a day I am now used to them.
The live voice is pretty good too and I can quickly mute myself. In fact, I usually keep it mute until I want to say something..
They are also comfortable and feel quite hearty (not cheap or flakey).