Great design, great sound, but not pwm.
I purchased 3 of these 140mm fans and a single 120mm for my nzxt switch 810, and i must say that my experience thus far is amazing.They're been running constantly for almost 3 months now, and i can barely make them out. I am using the included voltage "step down" cable that came with the fans. With that cable and a full power source (through the included fan hub on the switch 810) these fans maintain a consistent speed and reveal no "flicker" that other users have reported.However, i did test these fans with both a fan controller, and the on-motherboard fan connections, and with both of these power options i did notice significant flicker when the power was stepped down. This is due to the fact that these fans are -not- pwm fans are they are not designed to work at partial power settings. They look fantastic at full power, or half power **when using the included step-down adapted**. If you use a fan controller, or plug directly to your motherboard, you will notice flicker, and some "whining."overall, i cannot dock a star for this, because the fans do not claim to be pwm fans and are supposed to be hooked up to a full power source. They are very quiet and move a lot of air, and keep my toasty rig at a reasonable level.Other notes: the fan is actually a teeny bit thicker than most others, so they can be a tight squeeze in small places (ie: the font fan slots on your case)build:* intel i7 920 clocked at 2.67 (stock, will be ocing now that i have a non-stock heatsink)* msi n580gtx lightning* 24gb kingston hyperx ddr3 ram* 2 1tb hdds* evga nex750b semi-modular psu* switch 810 white case* antec kuhler 620 self-contained water cooled cpu heatsink* aerocool dead silence case fans (blue led (obviously)) 3x 140mm 1x 120mm for rad