Played it for a few hours today and finished the first 2 chapters.
The setting is amazing, it really feels like watching a performance in a theater. Japanese dub is really good and I like the JP narrator much more than the English one from the trailers.
Graphically it's stunning although sometimes there's a bit too much stuff on the screen which makes it hard to find your character. It's nothing game-breaking though and doesn't happen that often.
The game is a treat for secret hunters, since there are a lot of places which require specific heads etc. to activate the gimmicks, just like in the demo. I think that 100% it might be really time consuming.
Tl;dr - play the demo and if you like it, buy the full version. It just keeps getting better and better as you progress.