OK... so now I understand why this book became so popular :-)

It's that kind of book that I feel I should reread immediately after finishing it.
The part with the worked example is great, but personally I found specially interesting the chapters with insights about OOP design and sustainable TDD.

The ideal way to get all the value of this book is to write yourself the worked code as they are doing it. If you don't do it, at least take a look to the code here www.growing-object-oriented-software.com/

To be honest, I didn't grab everything they explain. And after finishing, the imposter syndrome is devastating me: I think I know nothing 0_o '

But it was definitely worthy and I'm sure it has helped me to become a better developer :-)