Well, I have it. But it would seem that M$ doesn't support it anymore. It didn't work under Windows XP with a Soundblaster Audigy. And the only update was a few years ago, and that was just to version 1.5. Honestly, if MS were to start supporting it again, I'd be all over that little baby. Voice command rocks, and it's got some pretty decent voice communication, too. Better than any in-game crap I've heard.
Iv got one. Depends on the price you pay for it. If you get it cheap (under 20 bucks) then its a good deal. The voice commands are kinda nice, but i havent used them in a while. Iv used the chat alot at lan parties, and the speakers / headphones switch is kinda useful, but i think my switch is kinda going bad. Basically dont pay full price, but if you get one for cheap its not too bad.