I have read everything of Vattimo's that has been translated into English and this fits well with his other works. It can be a good introduction to his take on religion and doesn't require a deep familiarity with his other work (or even other philosophers) to understand. Of course, you get more out of it the more background you have, but that is true with most books.
I liked the book because Girard goes after what I think is Vattimo's biggest weakness: his almost deterministic attitude about the future and how it will naturally move towards secularization and emancipation. This has always bothered me about Vattimo's work (though on the whole I am a big fan of Nihilistic Hermeneutics and Weak Though).
I was not familiar with Girard before reading this book, but have since started on his Violence and the Sacred. He is a formidable thinker and I can see how he was so influential on Vattimo. This book works as a good introduction to Girard as well.