Where's the Lefty Version
I've been using the Logitech Marble trackball for at least twenty years, maybe longer, and also switched from right-handed to left-handed use due to RSI-related shoulder injury. I'm happy that this particular model has been continuously available, as I've worn out two and had to replace them. I would be interested in a product like that reviewed here, but must have a lefty model and I have not seen one. The Marble is not side-specific so it works, but as has been mentioned it does require use of the fingers, and so is a bit of an additional strain on those of us who have issues with the Carpal Tunnel - yes I've had both hands "done." Don't know that it has helped much but didn't make anything worse.