I purchased a Logitech MX ERGO to give my sore fingers, wrist, and arm a break.
After using for about an hour I am starting to learn hand placement to use all of the available buttons. Then I slid it like a mouse to move the mouse pointer. More practice required to be as smooth as I was with the Logitech G305 mouse that I previously used.
Having Fun,
Roger M. Jenson