Summary: I bought this to replace a broken ruby orb cooler. The fan broke and can't be replaced, like this one can. Installation was easier than I anticipated for my AMD Phenom X4 9850 cpu. Idle temp dropped from 37C to 31C. The fan on mine is quiet.
Summary: Pros: Price isn't bad. Quiet. Cons: Thermal Compound. Mounting hardware is flimsy. Difficult to install on certain boards. Installing this cooler took almost 40 minutes, most of which was spent fighting with the provided mounting hardware for AM2 style boards.
Summary: Pros: Easy installation. Very quiet. Does a good job for the low price. Cons: 4 pin power cable means it wont work with older 3 pin motherboards. Applying the thermal paste was somewhat tricky. Copper tubing resting directly on the CPU leaves gaps you have to be careful to fill adequately.