I have this book. While it really doesn't offer much for new betta owners. It's not going to give your information on set-up, cycling, filters, etc. I like it for the section on wild bettas, genetics and most of all geography. I love maps! It has a pretty good chapter on diseases but I'm really not to keen on the treatments offered. It has extensive information on breeding & live foods.
A good chunk of the book deals with all types of wild bettas. So if you are interested in types other than splendins, this book will help you get your feet
The book seems really out of place at Petsmart, I consider it a book for the advanced keeper and not for a first time buyer who might happen to grab it on the way out the door with their first fish.