(sorry if my English is not very good, I'm Spaniard)
This box is one of the best documentary series I've discovered -even taking into consideration that I've become addict to the BBC-Earth series few months ago.
Firstly, these series are not about animals. Please, don't blame on me, I love animal documentaries, but these are the most typical. The series in The Box Set cover matters not frequently touched in the more commercial documentaries.
Prof. Iain Stewart is amazingly didactic and makes tough subjects interesting and easy to understand. The graphics, videos and charts are intelligent, conceptual but, at the same time, simple and understandable.
I noticed terrible difference between the two series in the box "The power of the Earth" (2008) and "How the Earth made us"(2010)... The first one (also first chronologically talking) is much more better. In "The power of the Earth" each chapter covers the different strengths that makes the life possible on Earth, and how they have influence in our living in an open-general point of view. From the volcanos to the ice, including the atmosphere, the water and other powers that, unnoticedly, have provided a difference to the Earth to make life and evolution possible since the Earth creation by stardust.
The second one, "How the Earth made us", describes some powers that shape our existence in some manners, but, in my opinion, not all the relations explained here are as clear and direct as in the first series. I think that the second attempt tries to take advantage of the success of the first one, but they didn't got such a good result. It's a good documentary, but not as exceptional as the first one.
All in all, I think that this box is a MUST HAVE in the collection of a documentary-lover and in the mind of the people that want to understand better how our planet works and why the Earth is, up to now, the only planet with demonstrated living existence.