JUST got a tablet after maybe a year of mouse + x/y from keyboard. Spent about 1 day getting used to it and tuning it my comfort zone. All I gotta say is, imo it's easier than mouse. I set up a small zone on it so my cursor moves quickly as if on high sensitivity, then I just treat it like a mouse but in pen form. The only reason I switched was because for songs with 750+ notes I always somehow seem to run out of room with my mouse and then I mess up because I don't get time to adjust it back into place on insane + higher skill lvl songs, but not at all with this tablet, it's awesome. Oh and spinning is hella easier, I'm a wide spinner with a mouse and can do over 400 pretty easily i just have to use hella arm force so it gets tiring, but for this tablet i just draw little quick O's around the middle which woul be hard as hell to do with a mouse, but easy with a tablet ^.^
*Edit* It has now been 2 days, I've went back to songs I've gotten A's on, and S'ed them if not double Ss'ed HELL i've even silver double ss a 5 star song on hidden which i didn't try before with a mouse. Besides the earlier things I stated, I'd say the biggest improvement I've seen using the tablet, is how much smoother my cursor flows, I overjump notes little to never now and it's sooooo much smoother.
On a side note, I'm a little scared, it's been about 2 days now and the portion i downsized my screen to for the tablet has already been scratched off a bit because i drag the pen rather than hover, i only pick up and hover to jump, though dragging us just as easy without hover.