Regarding the Mobile Studio Pro, I would say that if you're planning to use it outside of a work center, then it's probably too big and heavy to be considered "mobile". If your idea of mobile is taking it from one room to another in a work center, and you don't want to buy a desktop sized Cintiq, then it's the best bet.
As for using tablets in general for art, I would recommend them regardless of your level of skill. If you can trace, then you can make magic with a stylus. As your skills grow, you can do amazing things even without amazing art skills. Things that you wouldn't dream of trying with a mouse.
Personally, all of my devices are stylus enabled.