Pros: I'm a PC enthusiast that likes to build PC's and game at an occasional LAN party when time permits (take my review for what it's worth it to you).
Cons: Now, the only con I have about these fans is that you cannot put them horizontally facing down (so if you want them as top case exhaust fans - they won't work). I tried this and they became unstable and started to vibrate. I took them out and held one of them in my hand as it was running to confirm and in any other position they run smooth as butter (can't feel a thing) but as soon as I faced the fan downward it started to shake in my hand. This however, is a minor is...
Pros: Looking for Quality Case fans can be a bit of a chore. With manufacturers not always listing their specifications and so many "Cheapo" Fans out there it can easily become a daunting task just to find a decent fan let alone a great one.
Pros: These are incredibly constructed fans! I bought 4 for the Corsair 400R case and they took my system temps from 45C under load to 28C under load! I have two pulling air in from the side and two exhausting out the top!.
Cons: I'm not sure this is a con, or just because I got 4 of them, but they are slightly louder than I expected on Max RPM... Didn't take off an egg for it, but judging from all the other reviews I was expecting them to be whisper quiet.
Pros: I just got these today(10/7/2011). So far they sound great. No rattle. At max rpm they are not noticeable at all. Person below must have gotten a lemon because mine are dead silent. They are very well built. Do not seem cheap at all.
Cons: For a fan, they are pricey. Though for how silent they are and with such good cfm, It's worth it.