Very nice deal, I really like this headset.
The headset is extremely comfortable, and sounds quite good. It also comes with the adaptor, which can go for about $25 on its own.
The adaptor will let you use any headset with the standard ipod size plug, but I really like the Xbox set.
The only minor complaint I have is that they plug in right in the bottom of the controller, so holding the controller in your lap can sometimes bend the cable and cause static, but thats the ONLY cable you have to deal with. Going from the mess of cables I had with the 360, I'll happily deal with that small complaint.
Wish I had a microcenter nearby, I'd pick up another set at that price without a doubt.