I am in the process of looking for a ball to fit in my line up that will handle medium to medium heavy oil.  I currently am using my Roto Grip Grand Illusion as a benchmark ball, and am looking to replace it as it has several games on it.  I like the control and smooth hard arc that it gives me, which allows me to play it on several conditions that I currently see.  I have never thrown a track ball and would like to try one as my next addition to my bag.  

Your input is greatly appreciated.

Mark