OCC has published a review on the Cooler Master Hyper N620

The Cooler Master Hyper N620 lived up to my expectations. It is solidly built, engineered well, and performs well. The heatsink works on a variety of mounting types, even back to socket 754, which I was surprised about. The Hyper N620's base is slightly concave, as I pointed out the "pinch" on my nose while looking at my reflection in the otherwise mirrored finish base. I did check with a straight edge up against a light, and it was clear that there was a slight concavity. Not much, but it was there.

Cooler Master Hyper N620 Review