Does exactly what you would expect, it allows you to connect up to 4 Xbox360 controllers and headsets at once to play games on your PC. Installation was a doddle, although there are no Vista drivers on the supplied disk you can force the XP drivers and they work fine, or download the Vista drivers from Microsoft's site.
Pros - playing PC games with a wireless controller made easy as pie
Cons - No supplied Vista drivers, but they are still easy to get hold of
Final thoughts - if you want to use your 360 pads for PC gaming, look no further