Moving swiftly on, on reflection I feel that the best part of the movie was the end. Not because it finally did end, as some of my more snark-inclined readers might suggest, but because the end felt more realistic, and anything else would be too cheesy and conventional, to be honest. It's part of why it works so well as a film, as it has you really feeling for the character, and amps up the feeling of fear that the viewer is supposed to get. I worked out what was going to happen about two minutes from the end, in a flash of inspiration and the knowledge that it was just that kind of film.
If you like being scared by situations that are not that far outside the realm of possibility, then this is definitely the film for you. If you're not the kind of person who wants to watch Ryan Reynolds in a coffin for 90 minutes, then think about this: before this, neither was I.