I thought was pretty decent. I gave up on the Paranormal Activity films after the first two, because I felt that, for the most part, they were pretty boring. The only interesting bit would happen in the final 5 minutes, and the rest was a chore to get through. For some reason I noticed this just added to Prime and from the description got curious, and I'm glad I watched it. The setting makes it worthwhile, as it's genuinely creepy, and there are a lot more moments of getting creeped out peppered throughout -- although the final sequence is indeed the best bit. And I liked where it went, and how it ended. Not the best of films, and it does have some forced shots (to keep up with the idea that they are filming it), but I had a good time with it.