It was promoted as the princess at her "most candid, natural and charismatic".
There was plenty of emotional music, news clips, quotes from close friends and of course the tapes she'd recorded with her voice coach.
It was also brutally raw in parts.
And as it was being aired The Sun newspaper was reporting more salacious details that it says came from a BBC cameraman.
The Sun reports: "Princess Diana claimed she once spied on Prince Charles on the toilet having 'phone sex talk' with his now wife Camilla Parker Bowles."