Overall, it works very well and is a great value.  However, when received it went clunk, clunk, clunk, etc. and many customers would likely have sent it back.  I opened it up, and found that the wires that power the case fan (i.e. not he CPU cooling fan) were stopping the fan from turning and it must have some current monitor that turns the fan power off then resets and tries again.  The solution was easy, just moved the wires and secured them so they would not stop the fan, now I love the unit.