Summary: Decent for the price. Make sure you are ABSOLUTELY sure which way the airflow goes. The tiny black arrow on the side indicating it is easily missed.
Pros: Decent fan with very little noise. I can barely hear them running.
Cons: Holes for screws don't come threaded, manual wasn't in one of the boxes, and it's not a 3 pin fan. The 3 pin is for monitoring speed. Since it wasn't a three pin I had to daisy-chain two with my cpu fan. (I don't like trusting $100 cpu with two $6 fans).
Summary: Although the included wires are pretty long, one fan was almost too far away from the fan controller in my full tower case.
Pros: These are the quietest fans in my case, which to my mind is quite impressive for 80mm fans. Replaced 3 fans that came with my case with these, everyone comments on how much quieter my case is now (used to sound like a jet engine...).
Cons: Air flow is not very high, but I was expecting that, so not really much of a con.
Pros: Easy intuitive install. I daisy chained two of them to a single fan header. Very quiet runningy at 50% of maximum RPM in my application. Long wire harness should reach any fan header on your MOB.
Summary: Rather happy with this setup, at least my fans spin up and slow down depending on the CPU load, which in turn makes my CPU (Q9450) up to 10C cooler when doing complex tasks, such as gaming.
Pros: Somewhat quiet, can be daisy chained. 6 year warranty, Arctic Cooling brand name.
Cons: The reason why they're so quiet is because my BIOS reports them at 300rpm!!!! So I daisy changed all 3 of them to my CPU fan (Freezer 7) and they're at 1200rpm. Shipping price, it cost me double figures to ship 3 of them to me!!