I don't get the impression there's anything new or revelatory to hardcore Devo fans. It's probably like most documentaries of rock bands where it's packaging their history for the masses in a tidy, easy-to-digest few hours with every nook and cranny approved by the band. As a primer, I'm sure it's invaluable, and the archival footage is likely unbeatable for the usual reasons (access, the money to license and restore, etc.) but if you're extremely familiar with the band, I don't think you're going to learn anything new.