I have the Arctic Freezer 7, the only gripe I have about it is that the push pins are weaker plastic than the original Intel pins. The heatsink on my Asus P5NE-SLI board is fairly large and the bottom two rows of fins on my Arctic Freezer touch (had to be bent slightly). When I first installed the board, I didn't realize this and pushed a wee bit too hard trying to get one pin in, resulting in the plastic tip getting bent a bit. I had to bend it back but I'm not 100% comfortable that it sits completely flush. But my temps have been fine. 51-52C on 100% CPU load with a 25% overclock. Which in my fairly hot ambient room temp, is 1-2C off my stock temp with the stock cooler.
Other than that, the Arctic Freezer is good stuff. The detachable fan makes it super easy to clean dust off the fan/fins when need be.