PJ 20 is rich, smartly edited, brings incredible footage and tells interesting stories, but it should not receive 10 out of 10 for one big reason: it promises 20 years of history but only delivers 10. Obviously the first 10 were the formative years. However a lot happened during the latter decade which is barely touched by the film.
The nuance in a lot of segments is to be loved. But it is sort of tricky that the five of them never appear together in the present time interviews. It tells a lot about how this great band works and should have been further explored.
Overall though PJ 20 is a great film, specially for the initiated.