If you have the money to buy just one video about Jimi Hendrix: this is the one. The DVD consists of two parts: a documentary with interviews about his life and works, plus one of the Band of Gypsys concerts. The concert is filmed by an amateur, in b/w and without extra light. The filming has its flaws (a close-up on the 'psychedelic' lighting for instance), but in general it focuses on jimi hendrix, bassist billy cox and drummer/singer buddy miles. The concert is awesome, it is the crown on hendrix's short stellar career. There is other nice footage of his performances, but this one stands out, never mind the film quality. Sound quality is OK. Buddy Miles is not the greatest drummer around, but his contribution to this music was nevertheless very effective. And the play between jimi and billy is faultless craftmanship.
The other part, the documentary, also compares nicely with other documentaries (like Jimi Hendrix story). That's partly because it is intertwined with the concert (very well done), and partly because the focus is on the music. It's interesting and rewarding. Although it's the concert that I return to much more often.