I bought this book because I had to migrate from Google Maps v2 to v3. I was daunted at the prospect because at first glance it seemed that everything had changed. It took me a while to realise that although a lot of the initialisation code had changed, there was also much that hadn't, particularly that for the setting up of markers. The explanations in the book are clear and easy to follow. I could have done with a bit more detail in the chapter on migration. I'm now looking for the 'Intermediate' book, because this one, as its title says, is for beginners. I would certainly recommend this book for anyone beginning Google Maps.