Its a very good film, with as mentioned and excellent pacing, false shocks to throw the audience of the scent etc.
My only questions about the film were how different it would have been had technology allowed them a working anamatronic shark from the start of filming. I sometimes wonder if the film would have suffered by showing too much of the shark in the early parts, rather then using the methoRAB in the film and filming at water level so you can only imagine whats underneath until the end of the film when they bring the shark into play. Too me the film was more suspenseful after hiding the shark for the first half.