I have had a pair of these for a while and I love them - they work on both Xbox 360 and PC.
The sound quality is amazing.
Having owned a pair of Tritton headphones (Turtle Beach's main competition), I can say that these are much more comfortable and have better sound quality.
And the Tritton's aren't much cheaper than these - http://www.ozbargain.com.au/node/75540
This is a weekly offer from Mighty Ape - instead of buying a $100 new-release game, buy these to make all the games you currently own so much more fun.
Link: http://www.mightyape.com.au/product/Xbox-360/Turtle-Beach-Ea…