It definitely isn't for everybody and you definitely have to have a strong stomach, but I feel like this is one of the horror films that I would recommend.
It has strong elements of violence and abuse, but the way that the scenes string together to form a story, is absolutely outstanding, and the twists, unlike in some horror movies, are not predictable, they keep you on your toes and keep you guessing.
The storyline is good, the acting is good.
I would say overall this movie is 10/10.
Absolutely loved it.