hi every one, just registered to make a quick post about the above adapter
i downloaded the "BT5R1-GNOME-64.iso" to use as a live cd.

i went out today and got the "TP-LINK TL-WN821N V3.1 USB adapter" plugged it in and ran the live cd, Adapter seems to be working out the box.

putting the card in monitor mode with airmon-ng worked a treat, i have yet to test injection.

hope this was helpfull to some

EDIT:
Adapter works for internet, connected to my AP with no problems and web browsing was fine too.

Tested injection test passed.

this adapter runs on Atheros AR9287 Chipset
BT driver used: Ath9k.

Cant remeber the test i used to get this:
Ping (min/avg/max) 5.156ms / 5.156ms / 5.156ms Power: -53.00

if any one knows what test i used could you please tell me, im pritty new to all this.