I really do love this book. I've only just started to learn how to record and mix myself and had been muddling along looking up the odd YouTube tutorial when I got stuck, but just "having a go" without really having a structured methodology to apply. Hence my early mixes were typical of a small studio producer: too much instrumentation, very muddy, cluttered sounding and just obviously amateur in sound quality.
What I love about Mike's book is that he give you a method to follow. I read the book first cover to cover and his approach really appealed to me because it was saying: here's where you begin, next do this, then do this, etc etc, building on each layer till you get through the whole process and come out the other side with, at the very least, a well balanced mix. He spends the first few chapters giving advice on monitoring and supplementary monitoring so you can really hear what your mix sounds like. He gives you advice on acoustically treating your room etc so once you've passed through the first few chapters and followed his advice at the very least you will be equipped to "hear" your mix properly and therefore make properly informed balancing decisions.
Mike then explains the pro mindset to approaching mixing: editing first and getting everything sounding tight before you move onto balancing and using your various mix tools. He supplements every chapter with quotes from countless interviews with the world's best mix engineers and has really done an excellent job about finding the points of commonality between all these great engineers and how they approach mixes to construct an A, B, C, step by step guide that someone learning the art of mixing can take. Once you're well versed and producing great commercial mixes you can adopt any non-linear method you like if it gets you results. But for someone like me who didn't know where to begin, it was just so great to have a structured method to follow.
The other thing Mike does is augment the book with online resources which I frequently refer back to ask I go through each chapter. He gives you links to freeware plugins to supplement the plugins you might have in your DAW and recommends affordable plugins where he feels necessary. Mike genuinely seems to have a desire to give home studio or small studio producers the right tools to create competitive mixes.
This book has helped me adopt a professional mentality to how I approach recording, editing and then mixing. I can't recommend it highly enough, it's really a fantastic guide for someone keen to learn how to mix to commercial grade in their own studios and this book does a great job of demystifying audio production terminology. It's not an idiot's guide by any stretch of the imagination. You will need to concentrate and get your head around some difficult concepts but if you persevere and work through a mix project with the book, you'll see your skills as a mix engineer improve dramatically.
Not sure how useful it would be to an experienced mix engineer as that's not the perspective I'm writing from. But from discussing some of the ideas I've learnt with friends of mine who are experienced and studied audio production etc, it's been quite rewarding telling them some practices I've adopted that they didn't really do! :-) Good luck!!