I watched last night.
First 30 mins were good, nice to see a brief history and some information for beginners and good to see Kastel, a good Bob Peak/Coppola anecdote, some Alvin stories.
The next 10 mins were bashing modern posters (which was a bit tedious, to me it's just a change in style as we've seen through various decades of film poster design).
Then it moves to the alternative poster scene and the various galleries, artists, collectors. I know there's a divide there and some will sneer at the collectors queuing up all night to buy their posters, but I like the energy and infectiousness of the scene and it's fun to see a lot of young collectors enjoying the hobby. I like to see people enthusiastic about films and art.
There's also some relatively interesting stuff about the process (both prints and original posters), approvals/restrictions/licensing/store demands effecting design etc.
As a collector of both original posters and alternative prints, I quite enjoyed it. It's not very balanced though, too much prints and not enough original posters to be 'a movie about movie posters' as the tagline claims. It's nicely crafted and edited though (it could have done without the 'approximate resale' value infographics which were naff), so if you like films and posters or design, I'd recommend you give it a try. It's only 80 mins long.