Just got back from seeing that.
Scary, scary, scary. No special effects but alot of stuff HAPPENS. So many times watching scary movies a part of my brain is wondering how-did-they-do-that. You never totally lose awareness that it's make believe. This didn't feel like a "movie." That it was so real added to the whole effect. The Boy said it was difficult to watch towards the end he was so scared.
It's only playing at one theater in Dallas at the moment. I hear they are doing a limited release for now so word of mouth creates lots of buzz before full release.
Only annoyance was the young girls in the audience who kept screaming
Definitely go see it.