[redog]

I miss the old microsoft track ball. The ball wasn't a thumb exercise as it was under your index-middle-ring fingers and you clicked with the thumb.

[vel0city]

I've been using a Kensington Expert Mouse Trackball for several years now. You might like it for a center trackball position. It also has a ring around the ball as a scroll wheel and four buttons which are easily programmable. A couple of AA batteries last me about a year on the 2.4GHz wireless, many months on Bluetooth. The ball comes out really easy so it's easy to take apart and clean. It has handled almost a decade of near daily use without any parts breaking.

https://www.kensington.com/p/products/electronic-control-sol...

[loloquwowndueo]

Don’t current Kensington trackballs have this layout as well?

[redog]

Not quite, with the thumb buttons like the Trackball Explorer had. Closest I can find is the DEFT Pro https://elecomusa.com/products/deft-pro-trackball

[lytfyre]

They do, but I've had severe quality/lifetime issues with them. Three Kensington trackballs, two different models, all three lasted under a year for me.