Bought this a year ago and it still serves me in planning further SF roll outs. I use it in my project manager role whilst our admin requires more technical details and yet it manages to serve us both. Depending on your role you probably won't need to read the whole book though.
Very disappointed with the book, returned for refund. The table of contents shows a comprehensive list of topics, but very often the topics are made up of a couple of sentences only. The Salesforce help section is far more useful.