This might be a good book, but I can't tell because I don't have a spare scanning electron microscope handy to read the tiny, miniscule, nano-sized, infitesimally small fonts, especially in the diagrams and tables. I have other "pocket" books such as O'Reilly pocket guides which are not like this. There's nothing wrong with my eyesight, but this gives me a headache. Unreadable.
Anyway - the attraction of a "pocket guide" is simply that it is a condensed summary of a certain subject; you don't particularly need to put it in your pocket, so why not just make a normal sized book that's readable?
I'm reviewing the paper version, but I notice that on Amazon USA, both the reviews of this book complain about the Kindle version's unreadable diagrams and tables saying "All the diagram is just too small and when zoom in the diagram, you still cannot see it clearly because of its low resolution."