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.
Summary: Meets all of my expectations. Prior to installing my cpu would idle around 37°C and under gaming or usage load it would get up to 56-58°C with ambient room temperature around 22°C. Once I installed idle temperature is 27-29°C and while gaming and media streaming it doesn't get above 47°C. Using on a stock clocked i5 2500k sandy bridge with a discrete gpu.
Summary: I'm not a computer guru, but when I buy a fan that is supposed to run at 800 rpm on low and 1200 rpm on high I take it at face value. It was running lower than both when I first put it in. 300 on low and 600 on high. After 2 days of being broke in it spins a constant 800 rpm now on the high speed setting. The stock fan that came with my Lian Li case spins in the 900's so I figure 800 will do the job. The blue LED is neat, Not too bright.