I wasn't sure what to expect when I ordered this DVD but when I watched it, I was pleasantly surprised. I provides a good overview of Zep's history from start to finish.
It starts by showing how the band was influenced (American blues) and then shows how the band was formed. The documentary then goes into the history that mostly all Zep fans know about.
Another interesting thing about the documentary is that it shows how the musical "kings" of the 60s (the Beatles) gave way to the musical "kings" of the 70s (Led Zep). Bonham even talks about going to see that Beatles and being annoyed that he couldn't hear them.
One drawback of the DVD is that it doesn't contain any actual Led Zep music. This is because the DVD is unauthorized but the content makes up for it.
I gave the DVD 4 stars because once the documentary gets to the point where Zep is an established band there is not as much attention to detail as there was at the beginning. Still, I did learn somethings about Zeppelin that I didn't know so the DVD was worth it. Besides, there is plenty of information out there about Led Zep from 1971-1980.