wireless headsets are horrid i had one and it was crap i couldnt hear people properly,the sound quality was crap and echoed alot,plus the battery always died after a few hours stick to wired headsets mate
i had the official xbox wireless mic and it worked fine. the problem was that i went through 2 because their life span was about 7 months a piece.
i had the turtle beach wired headset for a long time now and it rocks. i could hear a pin drop a mile away. lol
So far, I have yet to see any wired headset that has Dolby Digital Surround Sound and also voice-chat capabilities through Live. X4's and X41 both have it.
I love my wired set. Being able to hear what direction people are approaching you from, and 1000 other things you never even noticed before...well..I'm happy. I'm sure Turtle Beaches are just that though. Wireless probably works just as well. But everyone should own a pair.