For the price, they are hard to beat for CFM to noise, they are made by the same oem that makes the Nexus fans. They are without a doubt better fans out there, but good luck finding some that are in the 4-5 bucks range, the Slipstream fans to me are the only other that are really worth a look at, but will run you about 7.50 a fan, however they by far out perform the YL fans. And have become my default choice when buying case fans that will not be horizontally mounted.