I had the best experience in my life about buying books when I did it for this book, on this site. I receive a great support for tracking the shipment and as soon I got the book, I started to eat it. Its very impressive how the author seems to know exactly what you are working on, and what you need and to be perfect, teach you the best and short way to get what you want. This book is not for beginners, but intermediate instead and advanced. Wonderful and I recommend it a lot...
