This is the only trackball for me -- I love the configuration, which allows for my first two fingers to be used for left-click/right-click while my thumb moves the mouse. I hate the split-fingered form factor that you see on most trackballs these days (although, in defense of that config, that makes it universal so lefties can use it as well).
This mouse might be great for someone with large hands, but it was oversized and cumbersome. I like a sleek smaller mouse, so it may have been partially my fault. Ended well as my son thinks it's bomb and enjoys using it, so it didn't go to waste
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