I gave this a watch after reading the book by Michael Davis. It's free on Pluto TV for anyone who is interested.
I have to say that my favorite part was the various Sesame bloopers that pop up (there's a particularly hilarious one with Kermit and Gladys). It was also great to see interviews with the surviving human cast members. This sadly marked the final film appearances of both Emilio and Bob, so I'm glad we got their insight. I was also shocked by how much footage they had that I've never seen before, especially the Joe Raposo interview & behind the scenes footage from decades ago.
I do think they kinda glossed over a lot though. Of course Jim's death was a turning point in the show's history, but Raposo, Calloway, and Hunt also died around the same time, and their passings had an impact as well. And they focus a lot on Jon Stone, but they don't talk about his disagreements with the show's direction in the '90s.
In general, this is worth a watch, but it's better as a companion piece with Davis's book, so reading that before watching this gives you the best experience.