bit_user :
Kewlx25 :
bit_user :
Noctua is more expensive, but definitely better than everything else I've tried. Now, I wouldn't use anything else.
How do they compare with Cougar?
Funny you should ask! I actually bought Cougar first, then replaced them with Noctua. That was about 5 years ago, so Cougar's current offerings might be better. The Cougar's were definitely quieter than the average case fan (I had both 90 mm & 120 mm), but they were imbalanced. You could feel them shaking, if you held them in your hand. Perhaps because of that, or maybe for another reason, they also emitted a quiet ticking sound. Still a decent value, if they'd lasted, but I opted to see how much quieter I could go and bought my first Noctua fans.
I had the same issue with Cougar fans with their supposed "hydro dynamic bearing". It's tough to take a company's word on bearings, a lot of companies like to like or just come up with some names and can get away with it legally. Half the fans out there are really just sleeve fans named something else.
Like the majority of FDB fans do not use the actual FDP bearing that must be licensed through Matsuhita/Panasonic. They get away with calling a sleeve bearing FDB.