This is a great book for those who want to learn about how to build a SRE team and the main concepts that need to be taken into consideration for a successful team.
On the positive front, it gives the reader a step by step approach on how to start such as definition of SLO as for when the team should take action so it focus only on what is important, to have the team focusing from 50% to 70% of their time in automating the resolution of problems and improving operations and smaller percentage of time in toil, and finally the blameless postmortem culture.
Another good point is the focus on the human aspect of processes (culture, respect, challenge) since it is paramount to have a functioning stable team. On the challenge front, it empowers team members to focus on the problem themselves and not just pass it onto someone else. On the respect, the blameless postmortem tell us to focus on the technical problems and everything that happen for the situation (incident) to occur and how it could be avoided with changes in tools, automation, alerts, etc and taking the blame out of people for their mistakes. Mistakes will happen.
A lot of technical details are provided on how to solve specific problems and this is great for those who are starting and do not have experience in SRE team. It also focus on many aspects of performance engineering, networks, parallelization, distributed processing and has great content for people interested in massive global distributed systems.
The downside is on the oversimplification of transitions and the marketing style of writing for some of the business cases. Since those cases came from companies trying to promote themselves, you may not find the real struggles and issues you will face in your team. At least some hardships are described and you are able to get a feel about the transition process, but in the end of the day, the tacit knowledge plays a big part and it is hard to find it in writing in order for you to be able to understand things that can happen (behavior, challenges, culture, issues, etc).
I strongly recommend this book for those who likes operations, automation, improving stability! Have fun reading.