Saw it last night.
Really really good. Actually one of the oddest things in the cinema for ages. I'm really digging Bad Lietuenant and this in that you watch it and can't work out really why you're so unsettled. I mean its pretty obvious whats unsettling in Dogtooth but its not like theres a conclusion that unsettles you.
and this might be a SPOILER but probably not:
Does she die at the end? I presumed she did but then others said she might have just been too scared.