Others in my squad have had occassional problems, but I have found the system absolutely flawless. People say I am always very clear sounding. The way others sound always depend on there settings and mic QUALITY. Whenever I cant hear someone well it is invariably mic quality. You get what you pay for and alot of people get ripped off.
A couple of guys in our squad have recurring cut out problems as well, but since it is always the same guys, I am figuring that has more to do with setup and machinery on their end than the AH side. I mean for christs sake the darn program is about 30kb in size. Not a whole to go wrong in 30kb. I think they have produced the most useful communication tool for games yet.
I use a telex usb microphone (built for telemarketers not gamers, 40 dollars at best buy, worth every penny), xp, and have an ancient c-media sound card, scavenged it out of a computer I found in a dumpster years ago. If that thing works, I cant think of what wouldnt.
also, people are always guilty of having bad sound drivers. Just because you can hear stuff when you installed it doesnt mean it is the best driver for your card. Good place to start is
http://www.driverguide.com username drivers password all
I got a 15 fps boost when I found the 'best' driver for my card.