Really well done film. There aren't many horror films around that manage to captivate you from beginning to end and genuinely have you question if what is being presented is reality or not.
I was pleasantly surprised by the strong, convincing cast. The overall atmosphere was perfect. It was properly suspenseful without being drawn out and the supernatural elements aren't exaggerated.
My one complaint would be that I do wish the whole Dani/Yana relationship were explored more. Without giving anything away, I found it really interesting and had hoped for Yana to have a more concrete revelation of her own before the ending.