As a big fan of this music genre, I was excited when I found this film, and I think no one gets disappointed with the results, the questions get answered, and it's a great opportunity to get into that world too. Of course there are some things only a fan could understand, but it's an enjoyable film for everyone. A good point to this film is the fact that analyze this "Metal World" in a very objective way, even when Sam Dunn declares himself as a fanatic. The interviews are adequate to the film and leave some opportunity to discussion. A documentary every fan should watch to learn more about that music or just to enjoy interviews and Metal Music.