I have personally taught over 20 CCIE's with this book at the IT Mentor CCIE Boot Camp. I think that this is one of the best books on the market for your CCIE studies.
The book is filled with easy to read, useful information. The labs provide very good practice for the CCIE lab exam. If you can master these labs, you have a 90% chance of passing the CCIE lab on the first try.