Anyone else here seen the movie "Anvil: The Story of Anvil"?

Tell me what you thought about it, any part of it, any aspect, anything goes. And as a secondary question, are there any bands you know of like this? By that, I mean bands who really were and are every bit as good as contemporaries who made it much bigger, who you feel just got left behind somehow, but yet they persevered for much longer than might have seemed prudent? Also, had you heard of them before the film came out? What are/were your opinions before and after seeing the movie.