There's some intriguing info and interviews in here if you don't know much about David Prowse.
However... The filmmaker inserts himself as a main character, which is kind of annoying, especially since he obtained some GREAT interviews from a variety of people close to the Star Wars franchise...including Prowse himself. Those interviews could've carried it just fine had that been the agenda.
Another small inconvenience (on the Netflix version anyway), there were no built-in subtitles for the two brief scenes that are completely in Spanish.
If you can get past those minor annoyances, it is otherwise decent.