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.

The film may be flawed, but its message is not.

The thing I enjoyed most about the film is the fact that it doesn't shy away from being a super-sized-cliche;

One of the film's great tricks is that, for a time, you think it will go down a rabbit hole of unrealistic glorification.