So I went and saw it.
It definitely creep'd me out. I usually don't scare easily, I'm a pretty logical individual and try and disprove stuff. but some of the 'events' were really creepy. I had to check under my bed before I went to sleep. Bring a friend.
Review below, so spoilers abound:
Like AFriendlyFace said, the boyfriend is kind of annoying, but provides much needed comic relief when it contrasts with the night time footage which is completely SILENT apart from the heightened sound so you can hear the entity. But when it cycled through the various nights, got progressively worse and rather eerie, you could feel the tension and breathing being held in the theatre for sure.
I felt a bit of a film makers touch though at certain parts (spoilers, if you care, but you'll just see it anyways). When Micah (the boyfriend) finds Katie outside on the hammock and then there is a loud crash upstairs and the TV is on, but its snowing? Poltergeist anyone? Towards the end when she comes up the stairs and smells Micah then attacks the camera is kind of stupid in my opinion and when she is in the bed towards the end and speaks with the double voice that is supposedly the demon, kind of like dear Linda Blair.
I'm a pretty hard critic, like AFriendlyFace I guess, I like my scary movies and I want to be scared. I was as I said slightly disturbed, not scared per-sey. I also disliked the camera because at certain times it would not follow them, like when she walks down the stairs and lets out that unearthly scream. You have NO idea what went on downstairs, I guess that was the intention if it was an actual film, but certain aspects just seemed a bit rigged.
She gets pulled into the hallway? Really? When she slides from the bed she has a brief rag doll effect, sleeping people usually aren't prone like that. The footprints and the powder only reminded me of Big Bird, so that decreased the spooky factor. Ditto with the picture in the attic, what self respecting torturing evil force does that?
Both of the characters also kinda of "fell" throughout the movie, became more tense, negative and ultimately fighting with each other over this thing they couldn't see. The part which had me shivering were the two occasions where she gets out of the bed and just stands there for hours, according to time cycling in the corner of the camera screen.
I did like how the camera was positioned in the bedroom, kind of imposing the bed and the couple then looking straight into that f**king creepy hallway, nothing was there ever, but I always thought there was.
I just gave a detailed review haha, but, I thought it was worth it, so go.