For grindcore fans, this documentary about the genre is definitely a must! It's absolutely awesome to see so many of the people influential to the genre tell their part, but I miss a bit more depth into the origins and history of grindcore. Still a great watch! For people new to the genre or don't know much about it, this can be a great glimpse into what drives people to enjoy this style of music.
You can rent or buy it DRM free here: https://www.reelhouse.org/deathbydigital/slave-to-the-grind