[O] Emacs and tablet devices

[Piter_]

Hi all.
It may be not the best place to ask, but:
How useful is emacs on tablet devices. I have been thinking about
emacs and freerunner. But I have no clue how the keybindings work
with it.
So my second guess is nanonote which has a keyboard (but i would
prefer freerunner as it has less moving parts).
Any experiense or tips.
Thanks.
Petro.