@gtwilson About 10 years ago I tried (at a friend's recommendation) a Logitech thumb-operated trackball with finger-operated buttons. He swore by it.
I tried to like it, I really did. But in the end I swore AT it. It was hurting the tendons in the palm of my hand & just felt plain weird. Took it back to the shop & exchanged it for a Logitech wireless mouse & a small store credit for future purchases.
I quite like the big Force-trackpad on this new 13-in MB Pro but gave up on the Apple Magic Trackpad with the iMac - it just never suited my style.
// @hazardwarning