I was put off by the negative reviews so this took me longer to get round to watching than it should. I'm glad I did watch it though as I found it really good, better than some of the recent big budget horrors.
The jumps are good, atmospheric all the way through, good acting, there is no special effects to speak of but visually it's really good, all in all a very satisfying horror!
Personally I liked the ending, it wasn't a let down like so many recent films...
Highly recommended.