Patrick Lencioni's "Five Dysfunctions of a Team" is essentially required reading for my teams - it is a great book to work through communication and trust issues in an organization. This book follows the same writing style, and has equally useful advice. I only gave it 4 stars however because the content is really focused at leadership - especially senior leadership, which limits the usefulness somewhat. The great part about "Five Dysfunctions" is that EVERYBODY in the organization contributes - we are all on some sort of team. "Silos..." puts focus on the goals and priorities communicated by senior leadership instead.
It's a good book, but not as good and immediately applicable as "Five Dysfunctions". If you have read that one and are looking for more, then this is worth it. If you haven't yet read "Five Dysfunctions", I would recommend starting with it!