This is a solid book on software architecture. Part I describes the fundamental concepts (architecture, architecture description, stakeholders, quality properties, viewpoints, views, perspectives). Part II shows how to define an architecture for a system, taking into consideration business goals, concerns, drivers and architectural principles. It also provides some pointers on how to produce the architectural description and how to evaluate it. Parts III and IV present a catalog of Viewpoints and Perspectives. Part V is actually a single chapter which contains some advice on what should a software architect do on different project types (e.g. Agile vs. Plan Driven, low risk vs large programs, etc.).
I found the advice in this book very helpful and on point. There are lots of small examples, but they are pretty small. I would have liked to see a couple of real life examples of architectural descriptions (maybe on the companion website).
From my perspective, parts III and IV are the most useful and the ones that I will come back to most often. Part III describes the most common viewpoints (context, functional, information, concurrency, development, deployment and operational). It presents the concerns addressed by the viewpoint, how to build models to present the views, common problems and pitfalls (with risk reduction strategies). Part IV describes the most common perspectives (security, performance and scalability, availability and resilience, evolution, accessibility, development resource, internationalization, location, regulation, usability). It shows how to apply the perspective and to which views, a set of architectural tactics for enabling the respective quality properties and common problems and pitfalls. Each chapter in Part III and IV ends with a very useful checklist of things to consider when using the given viewpoint or perspective.
All in all, a very good and thorough book on software architecture. Don't be discouraged by its size. You can use it as a reference book, choosing only the bits that interest you.