Review on Usongshine 3D Printer Cooling Fan 40 X 40 X10Mm 4010 DC 24V Cooling Fan With 2Pin Wire by Barton Perez

I bought these because the reviews said they were quiet. I turned on four fans at once, one in a week "failed" with a howl and a creak. So, after about two weeks, 3/4 of them are still quiet. I will report over a longer period of time. UPDATE: After three weeks, two Howlers, I downgraded to 3 stars. They don't seem to be any better than any other cheap fan. So now I rate them as disappointingly average in value.