It is not deep, but it is fun to watch. It does have a bit more of an edge to it than other similar films.

The film makes a home in your brain and the only cure is to see it again.

A film with more than the usual spoiler issues. Talking about it in any detail feels akin to handing you a gift-wrapped present and saying, "I hope you like it -- It's a thriller about a diabolical secret experiment."

One of the best movies of the year! Incredible from the beginning to the end.