I watched the documentary last night. Beside from the beautiful visuals (lots of digital painting of Leo) the most interesting parts were directors Michael Caton-Jones (This Boy's Life) and Agnieszka Holland (Total Eclipse) looking back at their experiences with the young actor Leo. To me it seems like Michael Caton-Jones is still in touch with Leo.
For me it's always nice to see all the old footage of Leo (like interviews, premieres -damn his fans in the 90s/00s were fuck!ng crazy- press conferences, etc) because I didn't follow him that much back then. But all in all it wasn't told something really new for us.
One of the more memorable quotes was from film critic Tim Cogshell (he seems to know Leo in person or at least met him several times) who said Leo is "the exactly opposite" from being an insecure "human being" especially when it comes to his level of fame ("for not one second, not ever").