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.