Summary: I have two of these as my front intake fans on my Fractal R4 case. I have these two plugged into the fan controller that comes stock with the R4 case, and I leave it on max. If that's truly "max", then I feel that the airflow is slightly lacking. However, they are quite silent and I am please with that. Together with two of these TwoCool fans, I have a Corsair AF140 as the exhaust fan, and two Noctua NF-F12 for my H100i radiator fans.
Summary: Fan was easy to install and works well. This fan is runs more quietly than the old fan. It has a small switch for running at high or low speed. I switched it to high speed and intend to leave it there. I would recommend this fan to anyone looking for an led lit cooling fan.
Summary: The blur color is a nice touch and the adjustable RPM switch is good, just runs a little loud for my taste on its high setting low just didn't move enough air. Good quality fan works fine nice buy for the price.