Confirm kljpmsd's experience.

I use an A5 Wacom Intuos Pen&Touch and a 3DConnexion Space Navigator and for the World I would not want to miss either of them. The morph brush is a stupid dumb thing without the tablet. The 3D mouse is just so much more convenient for navigation.  When you are low on $$ buy the 3D mouse first.

The tablet helped me to bring down pain in wrist and fingers, that is: I have far less trouble. That's also why I did choose the touch version: It gives more diversity in finger/hand movement.