Summary: -A bit noisy. Nothing outrageous but i was just expecting it to be quieter. For the size of the fan it's definitely not worth docking an egg but you will hear it running.
Cons: -Power connector says it's a "3/4 pin". Just so you know that simply means it's a 3-pin but can be plugged into a 4-pin connector. It's just an annoying way for the company to get sales by tricking noobies. ALL 3-pins work with 4-pin headers. Don't be fooled.
Pros: The only fan I tried to keep my case cool enough. It's a very awkward case. It has a single 92mm exhaust port. When the graphics card gets hot, every other fan I tried couldn't handle the heat. It's quite quiet while idle and only modestly loud while under load. It moves enough air to keep my graphics card's fans from spinning up and deafening me.
Cons: Temp sensor came bent down between the fan blades. Needs an IDE-style molex connector.
Summary: Designed for moving the most air possible - and it does move a lot of air for maximum cooling. However, its noisy compared to other fans. Good for servers where cooling is required and noise is a secondary concern.
Summary: I used this fan as a upgrade on a Dell Deminsion 4300. Mounted fine in the oem fan shroud for rear tower exhaust. The fan is not as thick as the oem but worked fine with no audible vibration issues. Moves plenty of air and not too noisy, but I have not stretched it out by no means. Great buy for a fan with thermale detection built onto the unit. Thanks eWiz!