The Silent Wings 2 of beQuiet is really a great fan! It offers two mounting options, a decoupled rubber mount and once a normal gland, as it has every fan. The additional decoupling of the fan, in principle, is inaudible! The only thing I've heard so far from my two fans, was the draft in full 12V, but the talks ultimately yes for the fans. :)
Certainly they are not the most powerful 140mm fan, but you have to decide now whether we want a leaf blower in the PC, or just a quiet fan, which also creates quite enough air out or or pure stem. :)
The longevity me this is very good! While all the other fans already quietly humming in my case, my first Silent Wing 2 after more than a year still as whisper quiet as before, which probably comes about especially by the hydrodynamic plain bearings, while the cheaper models have a simple plain bearings , Through this long-lasting storage of the price in my opinion is also quite justified! You pay once 22 and has for several years what it.
Finally, a small assortment of arguments:
Pro:
+ Inaudible (subjective opinion)
+ Good delivery
+ Low starting voltage
+ Maintains the quality over a long period
Neutral:
~ Air throughput (more than adequate for me)
~ Price