Pros: - These fans move a TON of air and are nearly silent. Even at 1000rpm, I have 5 of them in my case and they are a faint hum.

Cons: - NONE... BUY ALL OF THE FANS

Pros: These fans do work, extremely quiet and they move air with authority. I replaced every case fan with these and noticed temperature improvements, I also have a set mounted to my Corsair H110i GTX liquid cooler, it's a total beast with these, keeping my i7 5930k ice cold. Hydraulic bearings are the way to go, and well worth the extra cost; sleeve bearings wear out quickly and become super noisy after a while, they often don't like being put in certain orientations either, these Cougar fans don't care!

Cons: Won't help you win the lottery.

Other Thoughts: Buy these if you want long lasting, quiet, reliable fans.

Pros: Very quiet.
Push a lot of air.
Great colors. I've used red and blue in 2 different builds.

Cons: None.

Other Thoughts: I have used these fans in 2 computers now. They are the best fans that I have ever used or have seen. They are super quiet and push a lot of air. Like others have stated before, the red fans are orange when off but have an awesome shade of red when running.

Pros: First time using this brand, very impressed with the design and the looks of this product. It works quietly and effectively. Highly recommend.

Cons: NONE

Other Thoughts: I used the Blue LED fans for my build but all colors look good.

Pros: Nice leds

Build quality looks nice

Cons: loud at higher speeds

Pros: -Looks real good in the box
-Inexpensive

Cons: None that I am aware of.

Other Thoughts: Bought the fan to install in CM storm sniper case. However, due to my awful cable management I am unable to install on the available bottom fan mount.

Pros: This is a great fan. I bought 2 of this in 120mm, liked so much that I even bought a 3rd one in 140mm for the inside.
They provide a great air flow with low noise levels, also bought some other brand, but by far Cougar is my number one. The design and the LED lights are also something to keep in mind, they are very neat.

Cons: none, can't find any

Other Thoughts: They should come in twin packs so we could safe a fill pennies...

Pros: Very quiet, as advertised. Good airflow.

Cons: None so far.

Other Thoughts: Looks great in my HAF 912.

Pros: I dont have them in my case yet, but tested them out
I will be using these to replace the Corsair H110's default coolant fans.

The Blue LED is beautiful and its literally dead quite, i couldnt hear it next to my ear.

Cons: NONE

Other Thoughts: worth the money

Pros: The fans are almost non-existent ! I can't hear them and my computer is right next to me and they are great at keeping my computer at a low temperature.

Cons: NONE Yet!!

Other Thoughts: I bought these fans to go with a case that I have just recently bought, to replace the fans because the fans that are in it weren't cooling as good as I wanted it to and I am satisfied with the results.