The book is a really good start for those who have accepted that they are actually in Chaos and need a bit of Order in their life. But for those who don't think they are in Chaos or can never be in Chaos, they can ignore this book.
The book is not a list, as the name suggests. It has an Overture portion, which you must read before entering the chapters (rules). Instead, it is a compilation of the writer's experiences as a human and a clinical psychology scientist and some anecdotes and examples from biological, historical, religious and social sciences, which build up the foundation for each rule to stand upon.
How to read it? This part is quite important. If you are going to speed through it, as a target of completing your long awaiting lists of books, then you must not read it, because you would never get the very much drowned concluding sentences within each chapter or rule that are the message this complex yet clear writer wanted to convey.
Make it a 14-day book. That is way more than the average time to read a 400 (approximation) page book. But it is crucial to do that. One day for the Overture, if you want to skip the Foreward as I did. 12 days for 12 chapters and 1 Day for CODA (this one will be the most scintillating one; you will know why is it so on your own :) )
Take back and relax. This one needs time and focus to grasp its fullest glory. After all, a psychologist wrote it. ;)