Pros: got mine for $35 out of pocket
Cons: should have went to a GTX 670 instead
3570k @ 4.2GHz
ASUS P8Z68-M Pro (BIOS 3806)
N660GTX-Ti PE/OC 2GD5
dual 1080P 23" ASUS monitors
Yet to experience and detriment from the 192-bit bus @ 1080p resolution.
Did notice drop in Crysis2 FPS, but next driver release will address that one.
Runs so cool and quiet, that part is amazing.
Max'd at 70C during gaming.
As to the upgrade/sidegrade from the GTX 580 excpet for Crysis2 presently I can tell it's a better running card aside from compute, speaking on gaming and efficiency..
A more noticeable boost might have came from the GTX 670 from the GTX 580 but if this card settles in the $250+ range then I can see it's a force to be reckoned with..