As a beginner to ssh it was absolutely good reading. The author stress the point that this is not "do it all", but "do what you need" book. A smart approach in my opinion. The language is easy to read, and the examples are relevant for everyday use. He also points out that he leave the old days behind, focus on how the stuff works right now, today.
I have used many of his example, customized them to my need and secured my environments in a better way than before I read the book.