An exciting and entertaining thriller, which pulls off the plot device in a mostly satisfying way. It does start to stretch credibility towards the end, with the coincidences (and the cars) piling up increasingly quickly.

Reviewers have been saying that it's not as clever as it thinks it is, which I think is unfair - I think it's just not as clever as the reviewers expected it to be. I don't think it has any pretentions that it doesn't live up to, it's just an enjoyable thriller with an unsual way of telling its story. Take it as it is.