Pros: Durable, relatively inexpensive. Good quality product.

Cons: Hard to find a complaint about this device.

Other Thoughts: I've got a pair of these running nearly 24x7x365 in the top of a Coolermaster 690 II advanced. The 1st one since Feb 2011 and then this 2nd one which I just paired with the first one. They move a lot of hot air up out of the case, very quietly.

Pros: Looks great
Nice braided cable
Pushes air
Molex adapter included
Nice packaging

Cons: None to speak of

Other Thoughts: Use it on side of case to push air out, temps are lookin' mighty fine
Love the look of it, very attractive fan

Pros: After purchasing several different fans, I found this to perform the most silent and cooled fan. My R9 290 dropped 10f degrees after replacing 2 of my preinstalled fans in the Enermax Ostrog GT ATX Mid Tower. Very satisfied in how well it improved the temperatures and how quiet it became, I bought 2 more to add onto my case. After adding the 2 fans, my tempatures only went down 1F, I decided to remove one fan to see the difference. Having 4 of the same fans actually caused it to become noisy. Removing the 4th fan showed no difference in temperatures, but made my rig almost silent again with some humming in the background.

Overall:
-Great for the price
-Good quality
-A couple was more than enough to meet my needs

I would recommend buying these as a cheap alternative from higher priced fans.

Cons: I have owned these for at least 2 months, no issues so far.

Other Thoughts: I would recommend just sticking with 2 of these fans to push air from the front and use a single SilenX EFX-12-15 to push air out from the back. Any more than 2 of these fans may not really help temperatures. For now I'm just considering using the spare fans I have on my old computer set up for my little brother to have.

Pros: Fan is quiet and moves a lot of air. I purchased it because since the R9 380 upgrade things tended to get...toasty. I replaced the stock NZXT that came with the case and was rated at only 50 CFM.
Since then I observed 2-3 degree drop in idle (should be even more substantial during heavy loads).

Cons: It wasn't 2.99 like my last 140 mm fan purchase.

Other Thoughts: I installed the fan horizontally, some fans tend to change the way the sound according to the orientations.

Pros: -Inexpensive
-Move a ton of air
-No LED rice lights
-Come with molex adapters if you run out of headers
-Only draw .2A at full speed
-Very VERY nicely sleeved wires with a real durable rubberized mat

Cons: Sleeve bearing so I would not and do not mount them horizontally.

Other Thoughts: These things are spectacular. I have 9 fans in my case (3 of them are these) and need to get an aftermarket controller eventually so these are on molexes right now but wow they move a ton of air and are not too noisy at all at full speed via the molex connection.

For the amount of air these move and the quality of construction and the awesome sleeve job on the wires you simply can't go wrong with these in a vertical mount situatio

Pros: Good air flow and very quiet.
Performance on par with much more expensive case fans.
Have been working fine for 2 years in non-overclocked system.

Cons: Noisy when dust coated. While true of most case fans, these seem to be noisier than most when very dusty.

Other Thoughts: For those looking for illuminated fans these are only blue colored: they are not illuminated (which is what I wanted).

Cord is about 12 inches long.

Two of these replaced Lian Li front case fans in an Ivy Bridge build 2 years ago. Connected to a simple rheostat and running a little below rated RPM, they are very quiet unless they are very dusty.

Pros: Silent, even on 100%
Move huge amounts of air
Looks nice

Cons: Cord could be a touch longer

Other Thoughts: Fans, much like PSUs, either work or they don't. These work, Plain and simple. The fact they are whisper quiet is a plus.
For $10 these are a bargain.

Pros: Very affordable considering the performance.
Less noise and more airflow than the default fans in my Fractal Design R5.

Cons: No cons yet after a few months of use.

Other Thoughts: I like it so much I'm replacing the other two default fans in my Fractal R5 with these!

Pros: strong airflow,really strong

Cons: strong airflow,so not quiet enough

Other Thoughts: any way,this is what I need

Pros: Best case fan I've used and now my default fan.

These push the maximum amount of air for a 140mm fan. They run at the advertised CFM, and for air cooled PCs they are a boon. They have drastically lowered CPU, GPU and internal case temperatures.

Smooth running and quiet.

Cons: Only one color, Blue!