Summary: I recently purchased the H100 for my new build. Installing was a bit of a pain, but understandable. However once I finally got it fired up, I noticed a familiar noise, the sound of a searching HDD....when my build only has SSD's in it.
Summary: I bought, installed, used, and returned this product. CPU temps were great on stock speeds for i7 3930K. Noise wasn't. The pump made some mechanical whirring that I eventually just couldn't stand, so I switched to a heat sink and fan, which has also performed well.
Summary: Just bought the H100 for my i7-930 system. Fitting the radiator in my CM690 case was tight as advertised but I got it in there (had to drill a few holes in the top of the case as the radiator would not clear the memory and slide in far enough to line up with the stock holes in the case).
Summary: The H100 deliver good cooling performance however, the pump is making a noticable noise. It sounds like a hard drive read/ write, but constant. Did some search, some of the H100/H80 are suffer with this pump noise issue. Cosair need to improve their QA on finding out this issue.