Pros: Very Quiet
Good Airflow

Cons: None

Pros: Very quiet, even at it's maximum speed. Moves a lot of air. 6 year warranty. 150,000 MTBF.

Cons: Ugly in color. Wish they would make the exact same model in various colors like universal Black which is the most common color in a gaming case. At least they make their industrial fans in a greyish/black color.

Pros: Easy to install on my cooler master hyper 212 evo heat sink.

Cons: None, so far.

Pros: Very quiet with reasonable flow!

Cons: Ugly colors

Other Thoughts: Check for constructor site to check the frame size because it's larger at one side that making it not compatible in every computer case.

Pros: This fan works very well and you can control it with software, be advised these fans are meant to fit a 120mm mounting hole pattern.

Cons: None

Other Thoughts: I haven't bought a different brand of heat-sink or fan since I discovered Noctua many years ago, quality is everything with me, and these guys fit the bill.

Pros: It is extremely quit and work as intended.

Cons: Due to the extra 10mm I was not able to installation became a pain, don't get me wrong the product work. Due to that extra 10mm and also the screw holes does not match my tower specification made life not so fun.

Other Thoughts: They company or the vender should add for-warning that this product is not 140mm case friendly.

Pros: Fits in places that other 140mm fans might not.

Cons: Makes a terribly annoying whining noise, no matter what speed.

Other Thoughts: I received this with a Noctua air cooling heatsink. The heatsink itself was of good quality, but this fan is just terrible. No matter what speed I run it at, no matter what it is attached to (radiator, heatsink, or just a normal fan space on a case) it makes a ridiculously loud an annoying whining noise. Noctua has excellent service, and would probably be willing to replace the fan, but I switched to water cooling and have no need of it anymore. Just making this review to let people know.

Pros: very quiet,
nice extra large size
120mm mounts create big compatibility

Cons: doesn't replace a good heatsink
More than one doubles performance

Other Thoughts: this fan won't solve your problems all by itself, but its the first step to a cool, quiet case. I am buying more. 140mm fans just can't replicate its performance for the given dB.... Careful about spacing, these can bump into other components....

Pros: Very quiet, stable when running and air noise, "what air noise" I did not know about a premium fan until I bought four of these to incorporate with my Corsair Hydro Series H110.

Cons: Purchased only four, I like them so much I am going to get three more from Newegg to put in the front of my case,

Other Thoughts: This build was fun and was very enjoyable up until I finished it. Now I don't have anything else to put together in this build.

Pros: What can I say? If you look at someone's computer and you see brown fans, you know they mean business, and won't blow your ear drums out doing it. High air-flow, and quiet. What else can you ask for? Oh, the color! If Noctua starts offering other colors, I will start looking at other fans.

Cons: These are 140mm fans, but the bolt pattern is 120mm. So if you plan to use these on a case that has 140mm holes, buy something else.

Other Thoughts: A ton of people complain about the color. I shun them, because Noctua fans are always noticeable. I define good air-flow by the color brown, thanks to Noctua. I hope that they never change.