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I wish them all the luck in the world, but trackballs are bad for repetitive stress of the thumb joints and shouldn't be used by long term computer workers.

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I had terrible RSI from mouse usage.

Switching to a thumb trackball resolved those issues.

I suspect it was the act of switching that was key, not the trackball itself. I had horrible pain a year or so ago due to working with the lovely designed Apple Magic Mouse for so long. Eventually, I learned that for me, I was better off switching between devices. So now I flip between a trackpad and two different mice. That’s what worked for me.

I also did that in the past. After a while, I had to switch to another one for the RSI to go away. Eventually I was switching between a regular mouse, a Logitech with the thumb ball, a Logitech with the finger ball, and a Wacom trackpad with pencil. I also found out the remedy was more in the switching than in anything else. For years now I use the regular mouse without switching to others.

I've been using thumb trackball consistently for 15 years now.

I don't think switching devices is what did it.

I did lower my pointing device usage overall at the same time, so that has a confounding effect.

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