Summary: This is almost silent, and I can only hear it with my ear less than 6 inches from the case when it is open, and not at all when it is closed. It comes supplied with good quality metal screws, so mounting is easy. Overall, excellent.
Summary: Great little fan, runs very quietly and has reduced case temps by 15c. Also hard disks are running at 35c down from 50c previously, even with heavy load on the PC. The screws are the downside, very large for the fan, so I opted to use third party silent ones instead.
Summary: The screws are very big and needs a lot of efforts to screw them in, also the adaptor comes with a male plug to fit the power supply ( you need a female) The fan was noisy compared to my original and I changed it back.
Summary: Almost silent (near as damn it), moderate airflow. The ones I got report the RPMs incorrectly, but that's the only problem I had. Comes with fat stubby screws; not long screws and nuts, just in case you wondered.
Summary: Moderate airflow; the Akasa rainbow LED fan (which is distinctly NOT silent) moves a lot more air than this silent fan. Not sure it's the best if you have heat problems, but for normal use the flow is probably sufficient and it is nice and quiet.
Summary: Quiet but one niggle, the plastic is very hard and brittle, not like the plastic on the "black" fans which is softer, hence I needed a screwdriver that could give me a lot more torque to fit these.
Summary: Pretty easy to install, the screw holes were a little tight but not too bad, came with good screws and a power converter to allow molex connection if a motherboard fan output is unavailable. Very quiet fan, good airflow.