Loved it. Saw a really early showing and was glad to go for some lunch and a few beers afterwards as it was a pretty bleak watch. Best thing I've seen at the cinema in ages.
@blueturtle I hadn't seen it compared to The Witch, but it reminded me a bit of the Survivalist, and The Road to a lesser extend. I did prefer it to The Witch though, which I disliked apart from the amazingly monikered Black Philip.