I like the book, it's worth buying. My problem is that it's sometimes too long and not always that relevant. I would wish that the structure would be a bit clearer sometimes, that would help understanding the global context.
Good service but the book is boring. I thought they wrote it short and interesting to put all the important information in there, but that's ont the case. Instead the author writes 25 pages over his motivation writing this book, which is really NOT interesting to me.