Needed a USB wireless adapter, and wasn't keen on the "stick" variety so took a gamble with this one.
Fortunately the gamble payed off, installing on a Windows XP system is a doddle. The instructions are to the point, and the installation steps are easy to follow (basically, plug it in, and insert the installation CD when windows detects new hardware).
The adapter works perfectly. My access point is a couple of rooms away, but I was able to turn the access point transmit power down to 6%, and everything worked great! I have given only 4 stars... that's because I haven't found a way of turning the Linksys's transmit power down too.
It comes with a sticky pad, so you can stick it on a cupboard or somewhere (ideally away from electrical equipment). But the bit with the sticky pad can be slid away from the main unit, so if you need to take it somewhere you don't have to worry about removing the sticky pad. See, they put some thought into it!
Just a word about compatibility - this only works with XP / Windows 2000, so if you're using 95/98/ME this won't work for you.