IGN said the game runs smoothly and they are fine if it ships in its current form. Anyway, to the demo:
I find it very exciting that there are little to no loading screens, considering that you cant even install the demo to HDD. Another notable thing for me is the characters cutscene models and how they are animated, especially Snow.
Oh, and the magic spells. They look great: lightning spells, in particular. You cant cast them in the demo but the Judge-like boss can.