This book is not heavy. It is written by a fellow sufferer rather than an academic, and it comes across in a very sympathetic manner that I found easy to relate to.
The book takes you through mental exercises, motivation, exercise, meditation and mentoring. It didn't have all the answers for me, but reading it gave me a big lift when I needed one.
What stops it getting 5 stars? A whole chapter on alcoholism, from which the author suffers. The rest of the book is applicable to any depressive, but I suspect the differences between drink, drugs, gambling, comfort eating etc are sufficient to warrant a change to this chapter.