I've pretty much read the entire book. There's a lot of good information in it, but a few negatives stand out.
First, he really needed a proofreader. There are typos and other errors on what seems like every other page, and some of them are numerical, so the information is simply incorrect. Second, it's pretty clear he has a serious problem with MQA. For what it's worth, I agree that I don't need MQA, although it does seem like the idea of it providing confidence in the provenance of the file, if done correctly, seems like it's worthwhile. But he even dedicates an entire chapter to slamming it. I'm not able to comment on MQA's technical abilities, but it almost feels like he has a vendetta against MQA. It seems like he doth protest too much.
Now that I've covered the negatives, he does an admirable job of taking a truly complex topic and breaking it down into comprehensible fields. While most of us aren't going to build a studio and buy microphones, mixing consoles, etc., he covers what goes into making a place to lay down tracks that sound as good as the musicians who make them. He also goes into what's necessary for a good listening environment, and references standards whenever they are available.
The book is not cheap, but it could certainly serve to improve just about anyone's system. If you skip the chapter on MQA, you'll probably find it worthwhile.