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).
I love it! Works like a charm. I have arthritis in my hands and this trackball is perfect for me. Easy to use and doesn't cause as much stiffness in my hand as a regular mouse.
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