I got two of these (one for a friend), and as other reviewers have noted, the fan on one of them is loose and falls off its ball bearing. However, the other one I got doesn't have this problem (and still spins like no tomorrow), which suggests to me that the fan falling off is a defect. Will see if I can get an exchange on the defective one.
gdchenCurious if you were ever able to get a replacement for the unit with the broken fan, I would love to do the same so I can stop losing the fan. For now, I just have the cap sitting on top of my GPU in my case, because it's unusable :(