I had one for a bit but I didn't have any problems with it. One thing I will note is when the fans spin down the radiator does get pretty hot so you may want to use a custom profile and disable spin down if that is something you are worried about. I didn't bother replacing the fans or modifying it in any way.
Got one. Works fine. Gets hot as shit where that radiator outputs though! I second D-EJ915 - I used afterburner to keep the fans from stopping, or the top of my case would get mighty hot (OL-11 XL).