RRS makes some good stuff, but I think I'll stick with Gitzo/Arca for tripod/ball head... Their ball heads just look too darn big to me, nicely made I'm sure, but big.
Heavy too. They need to go on a diet! 
i concluded that the Arca is simply just better with the eliptical ball.
+1. My reasoning also. That and the fact that the ball is 54mm in diameter. 

