I have mounted this fan on my Zotac GTX 560 and can only conclude that this fan åstakommit great deeds! Original fan was a paltry centrifugal fan and temperature at some heavier game quickly went up in 65-70 degrees and the games started lagging.
As everyone says, it was the little meckig to mount, you are not used to fiddling with computer hardware so you'll need both time and patience. I sat there so many heatsinks I just got fit and changed the supplied thermal grease towards better from Zalman.
Pros: Sounds much smaller than the original fan and managed to simultaneously lower the temperature under full load from ~ 70 ° to ~ 40 °, and idle from ~ 35 ° to ~ 27 °. Then it goes still on the lowest speed (900 rpm), peak power is at 2000 rpm which teaches able to cool the monster cards anywhere.
Cons: Took about 1.5 hours to assemble it, but then I took it easy, did not do anything hafsjobb.
Conclusion: Awesome, buy!