Total mess.
Prism3 chipset is barely supported, hostap is working but fails most of time for no reason. Also it often fail to upload required firmwares to card.
Wlan-ng is supporting the card very well but it is a total nightmare to use. It doesn't use iwconfig interface and the "tools" to manage the card are more like developper tools than real interface stuff. If you don't know programming, you will never be able to use this. At least, the driver upload the firmware very well and support most features.

The card does work BUT it is very hard to use.