I have chronic tendonitis in my shoulders, elbows, wrists and hands. Seems I'm what is called 'a delicate flower' in my family - a term I coined for my darling children when they had invisible bruising, scrapes so minute you couldn't see them, broken bones that magically healed after an M&M, etc. As adults, that is one of their favorite 'Mom-isms', especially when they get to apply it to me!
Using the rotary cutter has been part of the problem. It takes some time to get the fabric ready for cutting on the accuquilt cutter, but most of that time is what I'd have to do before I cut with a rotary cutter anyway.
Even though it was an impulse purchase, I am getting my money's worth out of it and it is much easier on my arms and hands.
Wish I could afford the electric one, though. But that will never happen! I'd have to get all new dies, and they cost a fortune!