I already wrote about watching the first part, but the whole thing is just as fantastic.
The middle episode does feel like it has some 'middle volume of a trilogy' longueurs. It definitely dips a bit. But that reflects the state of the band at the time. They're trying to bounce back from George walking out and returning, they've moved from the Twickenham warehouse to a new studio in their Apple HQ, and they're rethinking the whole project.
They're contemplating what it's all about.
The third part leads up to the glorious rooftop live performance, which is glorious, and delightfully presented with split-screen images showing interviews with people in the street below and two bobbies coming in with 'Thirty complaints about noise.'
I wrote before that this is only for the true fan, but I think the third part would work even if you only have a passing interest.