The documentary is a good introduction for anyone not familiar with personality tests however it stays on the surface of the matter in both branches it tries to touch upon (namely the science behind the test, and the socio-economical aspect/impact).
But what is the worst thing about this documentary, and if I was rating only that, it would have been 1 star (at most) is what they have done with the sound when loud music always plays on top of people talking so most of the times you can't understand a word they say unless you use subtitles.