I just finished reading the book written by Fabrizio Volpe on Lync 2013 and my first impression is very positive (you can find information about Fabrizio here) .
The book has a well-organized structure and has a very fluid writing. This allows readers to read without getting bored. Entering deeper into technical topics I can say that is very comprehensive in all of it and personally there are parts of it that I’ve not yet had the opportunity to implement in my various projects such as SQL witness and all scenario in which disaster recovery is necessary by design. Topics about Enterprise Voice is very clear and to start learning about this very important argument it’s a good starting point.
Another important aspect is that it can be very useful for post-delivery documentation, for example during a project, each of us should write a lot of documentation and it must be complete and especially comprehensive as much as possible because customers could not be a Lync Expert; so this book could be for you. Obviously there are certain aspects that each of us must deepen with external resources , and for this reasons Fabrizio wrote, in the book, a lot of external link that help us on it.