Gravity - not a review
It doesn't happen very often that the price of a movie ticket feels justified, leave alone the extra money we need to cough up if it's 3D. Off the top of my head I can only think of Avatar and Hugo that justified the cost of 3D. I'm adding Gravity to this short list without any reservations.
It's one of those movies where you will actually regret not opting for 3D. I'd say go for it.