I think I've mentioned it somewhere, because somebody wanted to know a bit about it, but I'm not sure if iut was on this board. 
I didn't catch it in the cinema, but I want to see it in the future. I've read a lot about it (the film was quite popular for a documentary here in Germany). And if it wouldn't have been for the subject or the positive reviews, I would have noticed it because of Grning's involvement (Camera, editing, direction, production, I believe). 
Would be nice to read something on it by you. Has it received some international distribution? I believe it was a big festival hit.