Not so good
I didn't think he was much of a singer or guitarist and charisma wise Bowie's way better. Live versions of the songs not as good as the studio.ESPECIALLY Bang a Gong- you could barely hear the classic riff.
Hmmm, matter of opinion really and you are not really commenting on the film. The beauty of T. Rex live was their energy not just replicating the sounds of the records. As a piece of 'rock and roll cinema' this beats Pennebaker's Last Ziggy Show hands down.