I’ve been using a Microsoft trackball for about 10 years and I’ve not had any physical issues with my hands/arms.
When I moved to windows 8 recently on a new DAW I bought an Apple type track pad; the Logitech one but it felt a bit weird to me initially so put it in a drawer.
I might re visit it again and force myself to give it another go.
It was great for general windows 8 swiping/scrolling /zooming etc but in Cubase for editing it felt a bit unnatural, however the trackball felt like that initially.
MC