I ordered a few mastering books along with this one and found it quite interesting but not mind blowing.
It features a good presentation of a mastering office, even if other books go a bit further in the environment and specs. The main chapter features a lot of pertinent advices and techniques, described every time in a few lines but unhappily mixed all together : a bit of order wouldn't have bothered. The last part features half a dozen interviews (or more?), some were quite interesting and relevant for my needs, others were completely into electrical/deep technical stuffs that I wouldn't read nor recommend. Again, as said on my review of Audio Mastering - Essential Practices, I did not purchase those books to learn again on how a compressor works, so a bit disappointed there. The insights on EQ were nonetheless very instructive. Altogether its a fair book, the format is handy and I guess everyone, from amateur to professional would find at least a bit of unexpected and enriching content in it.