I have the Vapor-X, and, although it looks like a wimpy cooler, it does its job DAMN well. I took one look at the aluminum block and said "My Zalman VF-900 made of pure copper should be able to cool better than it can!!"
With the Zalman cooler, temps were around 65C idle and 95C load.
With the vapor-x cooler, temps were 44C idle and 65C load. O.O