This new version of the book has a new interior as well! The book has been thoroughly updated to include design topics and considerations for vSphere 4, vSphere 5, and vSphere 5.1. In addition to discussing design topics like management, storage, networking, and security, Kendrick contributed content around design considerations for vCloud Director. The updated and expanded content makes this a great resource for anyone who will be designing VMware vSphere environments.
I had the privilege of working with Forbes for several years. His knowledge of the topic is comprehensive and he applies that knowledge in operations and design work to produce highly available and scalable systems. This book and any other content you read from him on his blog are excellent resources to understand design criteria and issues.