This is a wonderful documentary capturing Bowie at his absolute prime musically and creatively.  The sound is excellent throughout all the performances.  My only complaint is that the limitations of the 16MM film and the lenses they used severely hampered the quality of the images that were captured on stage.  Quite often the lenses had issues processing the extreme colors and intensity of the lighting, so what you end up seeing is totally blown out and diffused or even out of focus.  Too bad.  It would be nice to see them take a better pass at restoration and release this on Bluray.  Overall I would recommend for any serious Bowie fan as the music is just too good to pass up.  The surround mix is fantastic, clear with a good amount of punch.  Worth it just to hear the soundtrack (which I already owned on CD) in 5.1.