You'll definitely like the ball and socket connection better than the flange and gasket type. They tend to seal much better, and you don't have to deal with the collector gaskets blowing out. I usually run a thin bead of ultrared or ultracopper RTV around the flange where it mates with the ball, just to seal up any little imperfections (Something I picked up from Snowmobiles and Motorcycles). I can almost guarantee you'll be happier with a clutched fan, than a flex fan. They're a hell of alot quieter, and *can* be more efficient. And I've never had a clutched fan eat itself at 6500 RPM and chuck a blade through the radiator =P Not saying it can't happen, I've just never had it happen to *me*. I can't say the same for flex fans.