I went and saw this with the missus. The film is about the people getting to their friend, not about the monster. If they don't know anything about the monster it won't be explained in the film. The whole thing was about the people. I thought it was a superb film. Definately worth watching at the cinema. Would consider buying dvd when it comes out, but only if I had good surround sound system as you need the immersive audio. I thought it was great that it was all on a camcorder as it made it appear more realistic. I also liked the fact that it wasn't a typical Hollywood 'fearless American saves the day' type film. If you were in that situation, that is probably what it would be like. Good, tense film. The missus liked it aswell.