I'm about 90 minutes in, I haven't even left the first building yet, there are game mechanics I don't really understand yet, and all I've done is read pages and pages of text.
It's utterly utterly brilliant, so refreshing, so well written, constantly surprising. It's a role playing game that actually makes me want to play a role, I'm playing as a psychotic, paranoid, fantasist. I'm choosing dialog options based on the role I'm playing, not based on what I would do or what I think would be the best outcome for the game. I can't remember the last RPG I played that made me want to do that.
If you were ever a fan of Planescape: Torment, you need to play this.