I bought it as I thought scrolling with my finger would cause more arthritis pain. However, I'm still using the finger scroll on auto-pilot and it's far less painful that the track ball i had. So after using autohotkeys to make the thumb wheel perform vertical scroll (it's horizontal scroll out of the box), I now set it with a higher/faster sensitivity and use it if I have to do a lot of scrolling.
I bought it as I thought scrolling with my finger would cause more arthritis pain. However, I'm still using the finger scroll on auto-pilot and it's far less painful that the track ball i had. So after using autohotkeys to make the thumb wheel perform vertical scroll (it's horizontal scroll out of the box), I now set it with a higher/faster sensitivity and use it if I have to do a lot of scrolling.