Summary: Great fan if you care more about either noise or CFM, and the "silencing" addition can be used on any other 2/3 pin fan. Only drawback is that it looks rather ordinary, should you even care about that.
Summary: You might want a fan mate for one of these if you want to adjust the speed easily or in increments, since doesn't have the 4th pin for PWM temperature control from the mobo. Comes with awesome rubber grommets to mimimize vibration noise. This is a great low cost fan. Any fans that are quieter move less air. Note: 120mm fans move more air for the same noise as a smaller fan...
Pros: can be manually set for either high airflow operation or fairly quiet operation (with the resistor)
Cons: slowest speed is not completely silent, however still provides decent airflow, so not a major weakness
Summary: The noiseless connectors work fine, but are a bit of a pain to install in tight spaces. It can be done though. They also feel like they would have limited re-usability; they seem like they'll eventually break from stretching too many times. Overall nothing wrong with the kit. Works as expected.
Pros: Good balance of airflow and noise
Cons: Would prefer regular screws and rubber washers for dampening over the noiseless connectors they use.
Summary: I bought this fan for the side panel of a Thernmaltake Tsunami Dream case because the original fan died. I have never bought Zalman fans before but they seems to have a good reputation so I thought I'd give them a try. The fan itself works great. Very quiet at 7v and no unusual noises from the motor. It moves a descent amount of air even pulling through a fan filter. I'm taking one star off though because the included noise reducer(basically a resistor) gave me trouble.
Pros: Well made., Quiet when undervolted., Moves a descent amount of air for a 92mm fan.
Cons: Noisy at full speed., Included RPM reducers get very hot!
Summary: Using the included adapter this fan is very silent, without it is still pretty silent as well but there are other fans that will outperform it at the same or even less noise level. Still, a great quality fan for low noise.
Pros: Cheap (sale or pm), Very quiet, Good quality
Cons: Better options if not using the noiseless adapter