Finally got around to sink my teeth into this one.
I love it alot. If you're into Deus Ex, Theif, and obviously System Shock games, you will love this. It's one of those FPS that you can play anyway you want, and where encounters with enemies will differ from room to room, and then you throw in the different paths, and different agilities, and you get a pretty replayable game!
It's basically everything those classic games were, and I'm only a couple of hours in.
To be honest, given that I love those types of games so much, and they are so few in between that I would be very well surprised if this game doesn't end up being my favourite of the year, perhaps longer. Thanks, Irrational, for taking the risk to get this out. And do yourselves a favour here and get it as soon as you can.
