Hi,
I got into PF during the "More" and then "Ummagumma" days. And then saw them with their Quadraphonic sound system at the Hollywood Bowl in September of 1972. Still, one of the best concerts I have ever seen.
All other PF concerts after that (4 of them) were all good, but the circus atmosphere was out of line, frustrating, and seeing the police pick people off the line at the Sports Arena, was not the nicest way to see a band, and then watch people picked off the audience during The Wall later.
All in all, it was disgusting and disappointing, though the shows themselves were good.
Of all of these, the Anaheim stadium shows were the best, and the bootlegs that existed of them showed it.
Of all their work, and the bootlegs I used to have, I like the earlier material better than the later material. I still get a thrill out of hearing 12 different versions of "Set the Controls for the Heart of the Sun", or 12 different versions of "Echoes" or 12 different versions of "Atom Heart Mother".
The later material is nice, and a listening pleasure, but in the end, I still go back to the earlier material as having more depth and beauty than the later material.