I've bought both the Carcharias headset and the Naga from Woot.
SO AWESOME. I haven't had any problems with it and I bought mine coming up on 2 years ago. Occasionally I will press one of the 12 buttons on accident, but you get used to it pretty quick. Here's my macros for the 12 buttons:
1 - Previous Tab
2 - Next Tab
3 - Close Tab
4 - Alt+Tab
5 - Alt+Tab+Tab
6 - Start Menu
7 - Hold down and scroll mouse wheel for on the fly sensitivity changing (a lovely feature btw, sensitivity becomes much more natural instead of a specific number)
8 - Close Program/Window (Alt+F4 basically)
9 - Switch Window to other monitor
10 - Text paste function
11 - Process Manager
12 - Enter button (surprisingly useful on a mouse)
Oh yeah and it has forward and backward buttons too, and I could change the functions of those and any other button on the mouse (any, even turn off the glow-logo).
I know the Naga is already sold out, but if you get a chance, I'd highly recommend it if you like buttons and prefer to have a POWER-MOUSE instead of a boring mouse.
Aaaasss for the Carcharias, they feel very comfortable and awesome, and I was using them for audio-output only, not bothering with the microphone until I needed it, but then I finally go to use my mic and it doesn't respond. I'm positive it's the mic because I've tested it in other devices and other (crappy old) mics in those devices too. So it was a DOA mic, that I didn't discover until much later, and I emailed Woot, but no reply, so I think I'm s.o.l. but I still enjoy them for their sound qualities and general comfiness.
Also, the cord can sometimes be TOO long if you're like me and sit next to a desktop.
Hey Woot, I see you seem to have lots of extra Carcharias headsets... wanna replace mine? ;D [preez?]