This book is intended for a computer science class. It's very, very dry, and its really not for everyone. The information doesn't ramp up at all, straight to advanced topics. With that said, it covers some great information, demos debugging throughout, and the author clearly demonstrates his strong knowledge of AJAX. The topics covered are worthy of a read. It's not for beginners to AJAX and/or computer programming. This should be the second book you purchase on the topic, after establishing a basic knowledge of AJAX. Worth a note, the examples use PHP, so if that's not your programming language of choice, then you might want to skip this one.