Some people like them due to the fin direction. But $50 like OMG be better of getting some thing like a MK-13 even more so if the side of your case has fan mounts or they can be added.
AC coolers are decent but since the one for the 2900XT they been pretty lame even more so with the shit little heatsinks you get with it.
http://www.overclockers.com/prolimat...13-vga-cooler/
Their actual site
http://www.prolimatech.com/en/produc...?id=159&page=1