It's a good concept but has its problems that lots of horror movies have.
****************Spoilers********************
Interesting at the start
Ending is terrible
It's like they couldn't find a way to wrap it up, and went with a cheap easy end. There could have been some interesting twists, but they decided, um uh let's make a strong female ending. When the interesting story could have been about her much more slowly realizing what happened, or her husband/boyfriend slowly losing his mind trying to prove he's right.
