Been looking for such a 3pin fan for a while to replace the one in my synology DS509+. For the longest time, couldn't find new ones anywhere at a fair price... until now. Works well so far. I can't confirm whether the device reads the speed correctly as I had disabled that functionality but my device maintains the right temperature so far. The wires are longer than my original which makes it easier to install. Shipping was fast too. Very happy so far.