Summary: I bought this along with a CoolerMaster JetFlow 120 - I prefer CoolerMaster because it feels more solid and this Noctua is actually just a touch wider than normal. I had to slice off the latch of my motherboard aux power connector. The fan I replaced, standard ANTEX top fan, fit fine, but this was about 1/8 inch too wide. I'd also note that the CoolerMaster has actual threaded holes and standard bolts whereas the Noctua has the cheezy squissy plastic psuedo-screws.
Pros: these fans move soo much air, but the insane thing is how quiet they are!!! i plugged in a "standard" 120mm fan, and even with 6 of these bad boys in my case, the 120mm was all that i could hear!! i have used so many fans i've lost count: noctua quality is unparalleled.
Cons: still not convinced with the colour. would love a black/white fan to match my 780T
Summary: Seriously .. these are creme of the crop. alot of people not keen on the color. These things reek engineering and quality. But Ill take performance over glittery blinking fans any day. I have used corsair, antec, nzxt and they don't come close to these when it comes to amount of air moved and how quite these are. They give you attachment for reducing the noise even more at the cost of rpm's, but really you wont need them.
Pros: Best Fans I have ever bought. Move tons of air and can't even hear them. You have to put an ear to them to hear them.
Summary: This is great, i though this was overpriced and ugly but the quality is amazing thus far.
Pros: -Almost silent at 12 volts. -Dead silent at 7 volts (still push a lot of air) -Works perfectly with my the fan controller integrated in my Fractal Design R4. -Comes with a lot of accessories that can help installing it on any type of case.
Cons: The only cons i can find is that the little rubber attachment are hard to install, but i don't use them since i prefer the fan to be securely attached with screws.
Summary: Awesome fan! Mine had a loud sound than the stock case fans but it pushed the air really really hard. So I decided to go into bios and set the fan manually at 70%. It ran as quiet as the rest and still pushed the air better. At one point I was sitting with my sister while putting my hand on top of the case where this fan was installed and said "It is cooler than an AC!