ENERMAX T.B. Silence UCTB12P 120mm PWM Function Case Fan

Pros: On low settings with PWM you can almost not hear them.
Good for quite low heat situations

Cons: Less air movement then I would have expected, but nothing bad.

Other Thoughts: I really like the fans, and would get them again. I am using them to cool an i3 case with a 650 ti, so not much heat. Very quite.

Pros: This fan moves enough air to be an effective cooling system, it has a 4 pin connector that can be used to control the fan speed (PWM), and comes with a molex converter if you don't plan on using the PWM feature.

Cons: Shortly after installing I noticed a clicking noise coming from the fan. It wasn't constant, it would click for a few minuets on and off. It wasn't very loud, but because the rest of my system is relatively quiet, the noise was noticeable.

Other Thoughts: Because this fan was advertised as a silent fan, I am disappointed. If you are going for a silent system, you might want to stay away from this product. However, if the noise isn't an issue for you, then this fan would work well.

Pros: As described, and quiet

Cons: None

Pros: I've had a pair of these in white for several years now, and just bought this black one for a new case.
These have been and continue to be the quietest fans I've ever owned. Using motherboard managed PWM, they'll turn down to 600-ish rpm at which point they are inaudible at 1 ft fully exposed. They'll go up to 1300-ish, but are still super quiet, nearly unnoticeable at full speed when inside the case.
I've had these as case fans (both intake and exhaust) and CPU coolers. They have almost always exceeded my expectations. As CPU fans, posiioning them above ram or vrm heatsinks provides extra cooling from the side vents.

The black one I recently bought ilves up to all my expectations.

Cons: A few small gripes:
One of the three of these does wobble. Its not loose, just the hub may be off-kilter a bit. It has not affected noise or performance perceptably, and hiding it as the "pull" fan in a cpu push-pull fan config took care of that.
Due to the easy removal of the fan from the frame, as a pulling fan they can pull the fan far enough forward to rub on whatever its attached to. Some spacers were necessary, except when mounting with the rubber screwless mounty-thingies
The frame can come apart when: you over tighten screws, flex the fan too much, or try to force it into tight areas with big hands. Under "normal" installation and use, this was never an issue. Only when tightening it on with a cable unintentionally stuck underneath it.
These fans will make you mad at your GPU & PSU for being too noisy.

Other Thoughts: I suppose some would take an egg for the cons, but if what you want is a quiet, long lasting fan, these are great. I've read the reviews by others saying they're not the quietest, but that hasn't been my experience.

Pros: Quite and variable speed. The price was good as well.

Cons: None

Other Thoughts: For those who complain about this fan I think you need to reevaluate this fan. I will buy more of these in the near future.

Pros: It cool's my PC with a sleek fan design, very nice!

Cons: None.

Pros: They are quiet enough
aren't as quiet as they advertise but they are about average
They look nice with the aluminum
have a decent airflow

Cons: other than they are just mediocre, I got the vegas for intake then these for exhaust, the vegas are just as quiet as these and look way nicer. but the vegas don't look as nice as exhaust and are more expensive. So these work fine, just not silent

Pros: Works as advertised. Hard to beat for the price

Cons: None so far.

Other Thoughts: Nice design. No LED, but sometimes its good being different.

Pros: Very quiet when attached to motherboard fan slots.
The aluminum looks great.

Cons: Static Pressure isn't as good but its very quiet.

Pros: Used this fan to replace the slim 120mm fan on my GeminII M4 CPU cooler. Not only are my temps down, it provides enough airflow to the heatsink that the rpm's never get too high, even when I'm gaming.

Cons: None

Other Thoughts: Very nice design.