We loved it!
From the opening scene on, I was tense, like anything could happen. With the pace and filming in some sequences, it really put you in the middle of those nerve racked situations. I felt right there in the moment with them. with her, the whole movie. Some of it was like that classic horror movie feel of "what is around that corner/what is to come?" type of fear. Thats hard to do IMO. Great filming, great cast, etc...