As I mentioned before, I have yet to find a mouse I can use comfortably. Which I guess is why I still stick to the trackballs and the MX Ergo in particular. Of course, my issues are more RSI than arthritis, but I find the 30 degree tilt (the extra 10% is apparently a Best Buy exclusive) works best for me.
I haven't spent much time with the dial outside playing with it in store though.
I also really don't know much about the Glance eye-tracking technology that Lenovo uses or Tobii, such as the MSI GT72VR TOBII. Guessing they are a pain in the butt to set up properly.