At that price you definitely got yourself a darn good deal. A 6970 is still a very capable card and with a heatsink like that you may be able to overclock a little and get more out of it. I got my 6970 to 980MHz, mind you, that was with an Arctic Accelero Xtreme 3 cooler but yeah, any game you want to play, the 6970 will bring you great performance!
I got one of these too. As far as overclocking it goes it seems to be locked in at 870 mhz. It's maxed out at 870 in afterburner. You can attempt to overclock it with saphire trixx, but bumped up just 10 mhz to 880, it was artifacting like crazy. Also, it just has two 6 pin power connections instead of the 8- pin and the 6- pin, so i think it may be a 6950 that was factory flashed to 6970 BIOS and then factory overclocked as much as possible. If anyone has had any luck overclocking one of these let me know.