Purchased this for my new rig containing an i5 4670k haswell cpu and a gtx 650 ti boost gfx card. In the time that I have been using it this cooler it has performed exceptionally, My Temperatures are (degrees celcius)
Idle Min:32 Max:33 Avg:32
Planetside 2 (I dont have any benchmarking software): Min: 37 Max:45 Avg:38
I originally purchased this because it was highly reviewed by PC Gamer magazine, who said, and I quote, that it was their "choice for 120mm cpu coolers" and to be honest I agree with them. The mounting system is akward (also picked up on by PC Gamer) so when installing it please note that the ridges on the retention bracket have to clip into the top of the bracket with the four holes in it for screws, otherwise both brackets will seem loose and that is bad. If you can get past the mounting system, your fine. Also note that the three pin plug for the pump (the cable coming from the water block) will work in a four pin fan header, just leave one pin out. Enough technical details, it performs outstandingly, especially on next gen haswell chips, just get one!