The Ralink chipset is fully compatible Linux (installed on Fedora Core 6). By cons I remove a star from the fact that the chipset was upgraded and suddenly the drivers, even those of the CD, have some problems to work. You have to go see the site advised by Ralink and build from source.
If the antenna is very powerful because I spend 20% with the old card to 50% signal.
Very good quality / price ratio. If you take this a UNIX system.