I bought an Intuos Pen because I get occasional numbness in my right hand from many years of intensive mousing. The idea was to feel the thing out, and then eventually upgrade to an Intuos pro.
But I still feel that, as a precision instrument, the mouse beats the tablet hands down, every time. The simple reason is that with the mouse, the cursor doesn't move once you have it positioned.
With the pen, you always get a little position shift from hovering to final click, because of the angle of the wrist and hand. There's no way you can manage to push the pen straight down without moving it ever so slightly.
I feel this could be solved by allowing the pen to drag the surface, then click with an added push. The sensitivity steps should be able to handle that - but even at maximum hardness the damn thing clicks the instant it hits the surface.
So I keep going back to the mouse for precision work.
Another thing is that I can't seem to be able to turn off pressure sensitivity in Photoshop CC2014, and just use the pen as a normal fixed brush. Pressure sensitivity is fine for painting, but for masking - where you don't see the stroke directly - it's a complete show-stopper. Photoshop says it's off in the control bar, but the pen still applies pressure. Maybe it's a driver issue that will eventually be resolved.