I'm looking to switch to trackballs just because I've started to have increasingly strong RSI symptoms is my right wrist. Also, considering the atrocious desks they have at my school, it would just work better for me, all things considered. So I'm looking for some recommendations. I actually placed, but then cancelled an order for a Kensington Expert. The reason why I cancelled is because I use Snow Leopard on 3 of my computers, as well as Windows 7. I noticed that it seems to be updated to support Windows Vista (and I'm assuming 7 because the kernel remains basically the same). I could be mistaken though (reading old sources); I noticed that there are updated OS X and Windows drivers for the Slimblade, but I doubt that they would be able to be used with the Expert.
I've taken a look at some of the CST products, but they seem to be a little bit out of my price range considering I'm just starting to try out trackballs. Approximately how long does it take to get used to a trackball, and do you recommend a large ball, center mounted trackball, or a side-mounted trackball like the Logitech Trackman?