Summary: I love that the wires have been sleeved. This creates a much nicer overall look (if your wires are visible) and that means it's one less thing I have to worry about when making my builds clean on the inside.
Pros: This is a great fan at a lost cost. I needed to add a front fan to create some more air flow in my case and it has done a wonderful job. It's very quiet and does a great job.
Summary: As italy said, these things are what I would call "noisy" at 100%. But, they blow a good amount of air at this level. If you want silent computing this is not the fan for you, OR voltmod OR use your motherboard's fan bios conrols; if you want "good" (75cfm?) air flow with a moderate amount of noise, this is the fan for you. Hopefully it lasts a few years.
Summary: I think the fan will be good if you have a rheobus that allow you to control the voltage to the fan so it's not spinning at 100% maximum all the time. It's a good fan, especially for people with fan controller - so you can tune down the voltage/RPM/thus - the noise.
Pros: It's a three wire and the wires are sleeved; nicely done. Moves a lot of air and does the job lowering the interior temp/MoBo of your case.
Cons: Extremely loud. I can stand some noise, but this is the loudest 120mm fan I've ever owned. It got to a point where I just disconnected it and take it as a lost, for the time being.
Summary: I love how some people rate this low because they say the fan never exceeds 1200RPM. 1200RPM is the normal operating speed of these fans but if you use a controller or your motherboards fan headers and set the auto fan control to "performance" (or whatever your brand uses) then they approach 2000RPM. Usually top out in the 1900's but still. Don't hook these up to 4 pin power and expect them to just crank @ 2000RPM and ALSO still be quiet.
Pros: Cool and Quiet if you use a fan controller or SpeedFan or your motherboards fan controls (QFAN on my ASUS boards). Comes with 3 and 4 pin connector so if you want you can just hook it up to direct 4 pin power and forget or use the 3 pin to pass RPM info to a fan controller or the motherboard.
Summary: OK, I was a bit worried when I read so many people saying this fan is loud. I have really good hearing so I looked up a decible comparison and 30db is approximately the sound a rain drop makes hitting the sidewalk. So I took a chance.
Pros: Lots of air flow.
Cons: It would be nice to have indicators on the fan showing the direction of the air flow.
Summary: I don't think it's unusual for a fan to make a little noise and this one is very acceptable. Would gladly buy it again.
Pros: It has a nice, consistent speed, quiet as can be expected, an it blows a nice breeze. Came with some additional wiring so i could choose whether I wanted to connect it directly to a 4 pin power supply or to my motherboard.
Cons: It's not inaudible. You know you have a fan on. But it beats the sound of my CPU fan going into overdrive like it was.