I've worked in DWH / ETL for over 15 years, I find the concepts of Data Vault quite interesting and I will try to use this on future projects.
Having said that: The Book in general I find not very well written. The Author seems very involved in this concept, basically because he seems to want to build his livelihood on his method, training and similar. The book therefore has lots of references to other books, which also seem to not be available at the time of this writing. I find it tedious to read that he is talking about subject a, but he can't really elaborate because that will be covered in a different book. Certain do's and don'ts he also keeps repeating to a degree that I find difficult to read, because of the repetitive nature and also repeated statements concerning breaking architecture will result in loss of core functionality and properties of the methodology. All that is fine and well, but it feels like someone talking to pre-schoolers, repeating over and over the same sentence. I would assume people purchasing a book like this want to learn and not be preached ...
Finally he also makes a lot of claims about technical facts like mathematically proven properties of the model, or how great it scales across parallel architectures, but neither claim is manifested anywhere in the book. No mathematical proves are actually demonstrated, and why the specific way of modelling data would be so much better for runnning parallel queries at DB level is also left for the reqder to figure out.
So as a whole you have a promising concept, which might be quite useful and has considerable potential to speed up DWH development and save during operations. However the book reads more like a mix of preaching with religious zeal and a very aggressive sales pitch.
For the EBook: I'm reading this on Windows 8 Kindle Version - here the pictures are almost illegible, you cannot zoom in and out of them - so while the ideas in the book are very valuable, the book itself would get a 3 star rating, as it requires quite some commitment to wowrk through. EBook Version deserves another star taken away, because you have to pay full price for something that looks produced to the cheapest possible standard.