I found this book to be very knowledgeable and it guided me to building my first comp.
The pictures are a big help so you can actually see how things go together and view the correct way of doing it.
I felt the book could have been a bit more informative on the exact step-by-step method for building a comp. I was somewhat confusing weather to hook up the DVD, CDRW, and/or tape drive before or after you hit the power button for the first time. The book made you feel like you boot up the BIOS before you hook up the DVD, CDRW, etc. which may or may not be correct but it doesn't really make sense. I hooked up everything then booted up the system so the BIOS recognized everything. It worked perfectly!
The modification section was informative but there should have been more detail for wire clean up to make the inside look pretty as well. There also should have been step-by-steps on how to hook up case lighting, the best positioning, fan hook ups, etc.
Overall I think it is a good book to purchase to better understand how to build a comp and to modify it to your liking.