I enjoyed myself last night at the 4:20 showing of the Phish 3D movie in Denver. In our theater most people stayed seated and the experience was pretty chill. I would have enjoyed more behind the scenes shots and some scenes of crowd costumes and campsites, but overall I enjoyed the performances.
The best write-up I have read today is by Luke Sachs over at Hidden Track- be sure to check it out.
I ran across this review video (via @yemblog)- the host has probably not seen Phish but some of the interviews and clips from the movie are entertaining.