You are absolutely right. This introductory section should be re-added in this and the other chapters. Why did I remove them? Because I didn't like most of them and I couldn't come with any good alternative.

I mostly disliked the intros for the last two parts:

> Still here after the first two parts? You are already becoming a Symfony2 addict!
>
> You are my hero! Who would have thought that you would still be here after the
> first three parts?

I don't like the *"Symfony2 addict"* mention and I absolutely hate the last intro. Are you implying that it's impossible to believe that anybody can stand Symfony for 30 minutes?