Our review of the Sennheiser PC-120 Headset for PC/Xbox 360 voice communications is on-line today, seems to work better than the official Microsoft 360 headset anyway.

One of my biggest problems with some of the other makes of headsets for the 360 is that you really cannot use them underneath a pair of normal headphones during those late night gaming sessions where you don't want to wake the neighbours. The PC 120s fitted perfectly under my Sennheiser 650s, and did not impede the sound quality too much either.