Good concept, poorly executed.

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."

A great movie, one of the best of this year. There was a bit of confusion at one point in the plot, but nothing serious.

The film's masterful storytelling did its job. The message was clear. No need to overdo.