I have a gently used Astro A40 audio system, I bought it about 10 months ago. This is the headset that MLG pros are using in all MLG tournaments, its the "official" headset of MLG. Its a MUST if your into gaming. The quality is way better then Turtle Beaches, I went through 2 pairs of Beaches before I got Astros.

You can hear people trying to ninja you in Halo. If your s1 on Guardian, you can hear someone switch guns on s3, you can hear people walking (great if they're camo), stickies fly, your grenades moving as you walk, weird noises on certain maps, weapon/shields spawn, ect.
It makes COD silly. You can hear everyone, everywhere. People can't crab walk anymore, or try to be sneaky. COD wasn't my game, and I'd easily go 25-5 with my crappy guns.

The mixamp has a few minor scratches on it, its been used. The only other thing that "wrong" with the set is that I lost the Astro USB, so I've replaced it with a Motorola USB. Not a big deal at all.

$200 shipped, obo.

 

Ahh.. this is tempting.. im using trittons right now and I was thinking of switching to these..