Pros: Somewhat quiet at the lowest setting. They're also a really good value for ball bearing fans with controllers.
Cons: One out of the three that I purchased makes a horrible humming noise and I'm forced to keep it set to low or else it's just completely intolerable. Even then, it's hardly any better than the scraping sleeve fan that it replaced.
Summary: Nice looking 120mm fan with a clear plastic case and mounting screws. [NB - colored units have sleeve bearings!] The 3-speed switch works well and the motherboard power connector fits properly but the Molex connector pins are 'over soldered', causing the mating connector's pins to be forced out of...
Summary: These fans do what they are supposed to do and the led is bright as well. The reason I gave a three star rating is because of the hassle of installing them. The screws that come with it do not fit the holes on the fan. I couldn't get them in all the way .
Cons: These are really hard to screw into place. I don't know if it's because the plastic is so hard, or the provided screws are just weak. I stripped one of the screws because my screw driver kept slipping.
Summary: The fan is okay... But thats about it. The three speed is a huge gimmick, and if you're going to hook it up to a fan controller you need it to be on the highest setting always. The LEDs compared to corsair fans are pretty lame too.