Reading this book was helpful in that it drew a clear picture of what causes depressed people to act the way they do, reassured me that my experiences are not unique, and reinforced some aspects of things I'm already trying to do. That said, one of the main things I got out of this book was that my situation is not all that bad. Many couples are in much worse off and much harder places than I am when it comes to one of them being depressed.
I did not like that the author puts a heavy emphasis on drug-based treatment. It is a strong theme throughout the book, and she basically claims that it's impossible to get better or for a relationship to survive unless the depressed person seeks this sort of treatment. I am highly skeptical of psychiatric drugs and I don't appreciate being told that there's no hope if one does not go this route. I don't doubt that they have helped plenty of people, but I do doubt that they are a cure-all, I am wary of the side-effects (including multiple situations I have heard of where being on or switching medication caused someone to become increasingly suicidal) and I question the claim they are the only way to get through depression. Of course depression means that chemicals and neurotransmitters in the brain are doing something different from in non-depressed people, but that does not mean that the only way that can change is through drugs. It bothered me that the author did not even consider the possibility that drug-based treatment may not be the right solution for everyone.
My other criticism is that there were fewer really practical, hands-on suggestions for how to communicate with a depressed partner than I was expecting. Overall, the book was a bit denser than I expected and based largely on stories and anecdotes. Recommendations of how to behave were buried rather than clearly pulled out and highlighted.
All in all, it is a useful book to get a deeper understanding and reassurance as the partner of a depressed spouse, but it is not the most practical book for my needs, and it should not be seen as the last word on depression treatment.