I've been a hobbyist mix engineer for about 15 yrs. This book validated much of what I've learned from my own experience and gave me some pointers for how to achieve some of the goals I've been striving for; for example, obtaining a depth of field in my mixes.
I wish this book had existed when I first started on this journey. It's written in the most straightforward language possible and focuses the aspiring mix engineer on an understandable and achievable process. I highly recommend it.