Short review: I've always loved the concept of one small decision changing everything in a massive way. We were actually warned by the director before watching this film not to watch it. I thought to myself, I've seen the worst of the worst, how bad could it be? This isn't a film like 'A Serbian Film' or 'Hostel' that sets out with no purpose other than to shock you as much as possible. But this film will drain you and have you thinking long after the credits roll.
There are a couple of moments of humour in the film, and they are genuinely funny moments, but because of the subject and tone of the film you feel like a monster if you laugh. I can't remember experiencing that before.
This is an emotionally draining film and not one that is designed for everyone to watch. However if you are game I think you will find it both rewarding and memorable. 8/10.