The first edition of Mixing Audio was fantastic reference for mixing music, and the 2nd edition makes a number of notable improvements. The replacement of the DVD with downloadable content is a much better choice for a number of reasons (reducing costs, more content, ease of updates, etc.) so I have no understanding of why the previous two reviewers here are taking away so many stars merely because a physical DVD wasn't included. If they ordered it online from Amazon, they've got access to the internet and can download it (yeah, it may take a while, but do it once and get on with life). Sorry, just a little frustrated that short-sighted folks are maligning a fine text for such ridiculous reasons.
In any case, if you're looking for a strong reference book for mixing music, this is one of the best. If you're looking for something more comprehensive than just music production (e.g. mixing for post-production, broadcast, etc.) then this may not be the book for you. This is specifically about music, and perhaps the title could have been altered a bit to reflect that. Mixing music has its own set of constraints that don't apply well to mixing ALL audio. That said, Roey does a great job of getting down to the critical operational details of mixing (the listening examples are very valuable here), which is invaluable. Too many books repeat canned recipes for how to process guitar or drums, without describing the relevant variables (both creative and technical) that the budding engineer needs to learn to listen for. For example, I have seen so many students utterly baffled by all those knobs on a compressor, paralyzed by the fact that they may know that attack and release, set wrong, may lead to something called "pumping and breathing" and yet don't know why it happens, what to listen for, or how to remedy it. This book provides one of the only sources I've seen for the level of step-by-step detail to develop their ears and their conceptual understanding of the process. Highly recommended, especially for the price (compare to other widely used audio production books, like Alten's Audio in Media for 3x as much).