+1
Years ago i switched to a pen because i had to do some repetitive work and felt my arm was going bad.
Since the pen I have had no problems of that sort- ( the height of the working table etc is also a factor to be considered)
Also - so much more refined to use !
I am using the small pen -tablet wacom , the larger the tablet the larger the movements you have to make; depends on the use
For photoshop etc the small one is fine, i find. Also i like the buttons to automate certain tasks.