First, installation: The fan was relatively easy to install, the only difficulty being that it's hard to get the screws to connect to the attaching point on the motherboard. The pre-applied thermal compound is perfectly good, and saves money and messing about.
Second, performance: The fan performs admirably at around 1500rpm, keeping my CPU at around 31C when browsing and listening to music, and the temp doesn't go above 39C when gaming. At this RPM, it's inaudible above my case fan.
Cons: The cons of this fan are that it does obstruct the first RAM slot on my motherboard, so I can't have a full complement of memory, but for the average user, 2 slots should be enough. Also, in an AMD system, the fan either blows up or down the case, which isn't great for cooling.
The main problem however, is that it sometimes causes a problem when booting up, and you need to press F1. This can be solved by disabling Qfan in the BIOS, but then the fan runs at a stead 2000 RPM, and can be heard a lot.
Ease of use
Value for money