Great film
Saw this at Toronto Film Festival and I was quite pleased with the film. The horror was very effective and the atmosphere was well done.
Levinson was at the screening doing Q&A afterwards and he talked about how he used different cameras (even iPhone) to create the mock doc. He said he didn't "create" the story and simply "followed" the story as it developed. It's quite interesting.
It's definitely not your typical run-of-the-mill found-footage film. I'd recommend it.