Agile IT Organisation Design is a good, balanced distillation of some of the current thinking in agile teams and divisional development. It's a good, short read too. Hence, it can fit into a day or two. For me, I don't mind longer books which present much more empirical data, but it's definitely worth a read and good companion if you don't have much spare time. I don't agree with all the content, but those bits I don't agree with are positions held by other people, not the author. So I can't fault the author for presenting that side of the divide, which is necessary for any equitable narrative.
This book is definitely a must-read for those who are interested in scaling up Agile from a practice adopted exclusively by software development groups to a more general way of organizing a full scale IT department or, dare I say, even a business-IT integrated organization set out to develop any kind of product or service, considering the pervasiveness of IT in today's activities.
The principles are set out very clearly, and concepts are developed from those principles very logically, in a gradual crescendo of depth and intellectual thoroughness.
If time allows, I suggest giving this book two reads: the first one to understand and appreciate the complexity and multi-faceted nature of the problem at hand (how to design an organization around Agile principles), which are very completely explained, and the second one to extract from the book the aspects that most directly apply to your organization. For those more in a rush (and maybe already familiar with Agile), a single, quicker and selected read is possible, with -- in my opinion -- special attention to be paid to chapters 5 and 6 (on team organization in the stricter sense), chapters 7 and 8 (on short and long term business-IT alignment), chapter 9 (on how to align the budgeting cycles with an Agile, long-term, value driven organization) and chapter 16 (on a summary of problems/remedies and a suggestion for implementation sequence).
Offers both great clarity and insight into alternative ways of thinking and tackling organisational design and governance that lag behind the reasonably mature practises of iteratively delivering value - a blueprint for the next evolutionary step of the journey