Some things I liked some I did not.

It's funny, it's tense, it features two great performances from two actors and the director expertly creates a web of odd tension where you actually don't know what is happening for the majority of the run time.

I think this is a new genre that they're all sort of working their way through it and haven't got all the kinks worked out yet but it's a genre that works for me.

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.