I bought this book for my husband and his family and for my family to help them understand my depression and gather some better methods for supporting me. It is helpful, as it is very informational about all facets of the disorder: what a depressed person experiences, different types of depression, medication options, etc.
One thing I was excited about was the list of "depressed people's sayings" and the list of responses NOT to give and alternative, better responses. This is a helpful list, since this is one of the problems I encounter the most ("You shouldn't think that way," "That's silly," "You're hurting those who love you"). However, the responses are repetitions, mostly of "I know you feel that way now, but we will get through this together." And, even though this is a good response, saying it as a response to everything someone says just sounds silly. However, the concept of the list is wonderful, since it serves the purpose of showing people flaws in their responses.
As is the case with this example, other advice/information is good and beneficial, but incomplete or repetitious. I suppose the excuse is that it's impossible to analyze a disorder that is different for everyone, hard to pin down, and extremely difficult for a non-depressed person to understand.
However, for a general overview and introduction to depression for non-depressed friends or family members, this is a good book to buy.