Review on ARCTIC F12 PWM PST CO - High-Performance 120mm Case Fan with Dual Ball Bearing, PST and PWM Technology - Grey by Aavon Dark

I ordered eight of these to fit in the top of the Thermaltake Core X9, unfortunately after installing the fans it turned out that three of the fans were broken. The fans snapped at the attachment point on the inner shaft, rendering it unusable. I have requested an RMA from their support and will update when the process is complete. UPDATE After I contacted ARCTIC support, they sent me replacement fans with no problem. Because of the product support, I would buy them again at any time.