It was a lot noisier than the <20dB specified...until I realized that the store is selling the EC8015"M"12CA version instead of the L
M = 2500rpm <26dB
L = 2000rpm <20dB
The push a lot of air for their size. I bought 1 to instal in my VGA holder bracket (comes with the CM 690 II Advanced Mid tower case) to get ready for my SLI set up as my graphics will be right ext to each other to take advantage of the 2 PCIe x16 slots (which are right next to each other).
Weaknesses:
They are a little loud. I'd recomend and will be getting a fan front panel controller for this fan and the rest of the fans in my chasis