The book is designed to be accessible to motivated IT professionals who want to learn more about the specific attacks covered. In particular, every effort has been made to keep the chapters independent, so if someone is interested in has function cryptanalysis or RSA timing attacks, they do not necessarily need to study all of the previous material in the text. This would be particularly valuable to working professionals who might want to use the book as a way to quickly gain some depth on one specific topic.
There really aren't that many books on cryptanalysis (as opposed to cryptography) out there, and so it's quite a nice surprise that this one manages to be readable, useful, and encyclopedic. If you have any interest in the field at all, you'll eventually end up owning this book. And you'll probably enjoy doing so.