Summary: This heatsink is a massive pain in the arse to install, it's fiddly, and you need to pull your mobo out of the case. Even then, it might not fit in your case anyway because this heatsink is bigger than many small cars.
If it will fit in your case and you do manage to install it without killing your PC, yourself, and everyone you know and love (did I mention that it's a massive pain in the arse?) it is a god damn excellent heatsink.
Summary: Good cooler bought even though other poor review, however i know understand why. If you don't read the instructions you can make the mistake when installing the backplate, and could easily damage the motherboard by incorrectly installing the bolts for the cooler.
For note for others you must install the bolts into the backplate before you install the caps to hold them, it isn't completely obvious but a bit of common sense goes along way.
Summary: I became a fan these type of heatsinks Zalman made after I first purchased the Zalman CNPS9900-LED CPU Cooler (Socket 754/939/940/AM2/775/1156/1366) unit. In fact I bought two of these for my two rigs in two different countries. Because one of the heatsinks was partially damaged during a move, I decided to order this seemingly updated version of the module.
I run AMD CPUs for the AM3 socket.
Summary: The cooler works well. I tried to get my hands on a red LED version but they tended to be 20$+ extra, which i found not to be worth it. The installation was going well until I hit the last screw in the upper back corner of my case (Corsair Carbide Spec 03). It was TIGHT and I wouldn't have been able to get the tool or the screw in place unless I removed the back case fan.
Summary: I think that for the price, it's a really good cooler.. I've had it for almost 2 years and it has been great... only once had a problem with it because it was extremely dirty, when disassembling and when I washed it, the fan stopped working... I looked for a way to change the fan but this is a very specific fan mechanism made for this fan only... After some cleaning the fan started to work again which made my day...
Summary: I've use Zalman products with excellent results before so this is extremely disappointing. I tried to install this on Asus for Phenom XII 955. It wasn't meant to be. don't waste your time or money. this is a poorly designed product. there is no way to install the fan on the CPU without a 2nd pair of hands. the supplied hex isn't long enough nor sturdy nor the right size for some of the screws. it shredded one and I was able to salvage it with my own, bigger hex wrench.
Summary: I'd rather pay an extra $10 and get one specific to my motherboard. Zalman is getting cheap and I'm finally fed up with them. Was easily the worst part of my new computer install. Previous models have instantly snapped in. Will not be buying Zalman ever again.