Summary: I got one of these to replace a noisy fan in a case with two fans. Even though the other one wasn't defective, I decided to order another one of these and replace that one too. The fan comes with rubber pieces to mount it. I know from experience with other Antec fans that that works well, but I didn't feel like taking out the motherboard to get the clearance I would have needed to do so.
Summary: Super quite although not amazingly effective. You certainly will have trouble hearing this fan. Also! Make sure you buy fan screws or have some that come with your case as this package comes "screw-less" including this silicon mounting "screws". They're nice, but don't fit all cases or work in all situations.
Summary: They're definitely quiet. Don't move a lot of air, but those are kind of directly related. I installed 2 in my HTPC case since the CPU fan kept revving up while I was watching shows. Now that fan doesn't ever come on so my computer is nice and quiet. I'm happy with them.
Summary: This fan was was to install, I have never used the rubber "tool-less mounting" systems before, and It worked just fine. I have this fan mounted on the GPU side of my Antec GX700 case, a product I am also quite pleased with.
Summary: Fan gets the job done but runs slower than any case fan I have ever used. According to my pc control and monitoring utility program fan only runs at 732 rpm, I don't know how accurate that is but it looks like its moving slow