This approximately 650-page book is not something you read from cover to cover enthusiastically, and I've actually heard people referring to it "yes, that thick blue book that nobody reads". It's a shame, because this is a pretty good book! (That deserves a less boring cover, if I may say so.)
The book's strongest selling point is bringing very different set of people to the same page, and making them use a common language. It's not infrequent to see Vice Presidents, Business Intelligence team leads, data stewards, big data developers, data scientists, and database administrators use very different terminology even if they're discussing the same topic, in the same meeting. In order to prevent people talking past each other, having a body of knowledge that you can frequently refer to, and that's based on de facto standards and definitions is invaluable.
The book covers a lot of ground, and therefore depending on what particular role you have as a data management professional such as a database administrator, developer, Data Steward, Data Strategist, or Chief Data Officer, different sections will deserve your focus. In my case as a Data Officer, I found chapters on Data Governance, Data Architecture, Data Modelling, Metadata Management, and Data Quality particulary useful and I was also happily surprised to see a whole chapter dedicated to the difficult, yet oftentimes ignored topic of Organizational Change Management.
I have no doubt that I'll return back to many of the chapters to revise established practices for data management, and also recommend some relevant chapters to the colleagues. Moreover, I already found the recommended reading section at the end of many of the chapters very useful.