In fairness to the people that make the RocketMouse, I have to chime in again to say that I'm learning how to use it and the more I use it the better I like it!
The only disappointment now is that I found out the mystery button (that doesn't do anything for me) is supposed to turn the trackball into a scroll wheel. It doesn't work on my Macintosh, and I haven't heard from them yet if I have a faulty device or if it just doesn't work on Mac.
Thanks BigAl for telling me that using a trackball takes practice. I was thinking that maybe I was just too uncoordinated to make it work but you're right, the more I use it, the easier it is.
Take care, Margaret