The book is great in content for the reasons others have given. You might want to bear in mind though that the copy on offer is not only coming from India, but is also in fact not authorised to be distributed outside India - a fact written in the bright red top left corner of the front cover (zoom in on the image and you'll see it). People have different views on these issues and if the book is only going to stay on a home study desk you may not care. If you're going to have the book elsewhere eg on your desk at work, you might be less comfortable with that.
I received my copy of this book while I was working at ARM as a student.
Although some of the products described have ceased production, the book provides useful insights into the evolution of the ARM architecture, and how it's come to be used in the industry today. Crucially it describes the ARM7 core and it's derivatives, including the THUMB instruction set. While also mentioning the StrongARM and ARM9 families.
ARM7 is ARM's workhorse product and is still incorporated into new parts from many silicon vendors.
This book is an invaluable guide to understanding and getting the most from the ARM Architecure, and while it won't replace a datasheet, it's ease of readability and accessible style make it perhaps the first book that anyone considering ARM should read.
This is a fantastic book written by a great engineer. It not only provides a complete introduction to the ARM architectures and instruction set, but can also be used as a reference by anyone involved with, or using ARM microprocessors and SoC's. For a graduate like myself, preparing to start work for ARM, it is proving invaluable. Besides, it's also a great read.