Summary: Shipped with Newegg saver and it took ten days to arrive. I was beginning to think FedEx lost them. Finally they arrived and I could finish my build.
Pros: Clear with 4 holes for LED's if you want to light it up. Super easy to install, rubber mounts are good quality and don't break even when really stretching them. Cable is sleeved in mesh and has heat shrink on both ends. Fan runs smooth @ 500 ~ 2000 RPM and is silent.
Summary: I seem to remember there may have been a setting in Speedfan that got rid of the noise, but I stopped using Speedfan and gave up on this fan long ago. Lots of people seem to like this fan so maybe it is just not compatible with the pwm circuit on my mobo (ga-ex38-ds4), although I've got another brand of pwm fan running happily at the same speed without any noise.
Pros: Moves air
Cons: Mine has the chirping sound at low speed like MrPogi's review states below. Mine is running at around 800-900 rpm. I guess the sound goes away at higher speeds like MrPogi indicated, but that doesn't do me any good when I'm using very little system resources surfing/emailing/etc and the bios chooses to run the fan at low speed. It should be the most quiet during times like that, but it just has that annoying whistle. I know the sound is in the electronics, since I can...
Summary: These fans are 'really' silent and reliable. I have installed them in multiple computers and use them for the computer case and the CPU heatsink cooler. It is easy to see why "www.silentpcreview.com" uses them as the baseline reference for comparison with all computer fans.
Summary: i can only hear the fan if my head is less than 1 foot away from the fan. it doesnt move tons of air, but it moves enough for what i need. if i needed more silent fans, i'd gladly get these again. edit: wasn't sure how to use the anti vibration mounts, here's what i did. i think you are supposed to use them instead of screws. so i use screws in opposite corners. in the other corners i shoved the rubber point thing through.
Summary: This fan pushes a lot of air and is nearly silent. I can hear my GPU fan over my case fans (these units). A very nice quality fan to replace your fans. Comes with rubber mounts as well for vibration. Very happy. Have had them over a year.