I bought it and skimmed through most of it, and I have a hard time recommending it personally. It’s really short on the crypto and offers no insight into why TLS behaves the way it does. I would like to at least see an explanation of the TLS handshake process, but there is none. It’s a lot of “using openssl s_client”-type of discussion; i.e. how to use it, not so much on how it works, and that applies to most of the book (including the ocsp parts).

Practical, not necessarily theoretical; but if that’s what you are looking for, then it’s a great book.