I cannot really say but the price seems reasonable compared to what others are pricing. As far as I know there is no technical stuff in the Magnum one but how Alec thinks and sees and approaches things.
I found two other smaller documentaries on Vimeo which I can recommend, especially the one about Shore. One is about Alexc Soth and the other about Stephen Shore.
They are shorter and very affordable and interesting and I bought those. (
Watch ALEC SOTH - New American Photography Online | Vimeo On Demand on Vimeo and
Watch STEPHEN SHORE - New Color Photography Online | Vimeo On Demand on Vimeo)
Hope this helps a bit.