I'm the target audience for this book, which contains autobiographical essays by the SF writers I grew up reading: Robert Silverberg, Damon Knight, Fredrik Pohl, Alfred Bester, Brian W. Aldiss, and Harry Harrison. Aside from the personal stuff about their lives, the authors also give us some wonderful insights into the history of SF as they experienced it. Not only that, there's a section at the end called "How We Work" that gives each of the writers a chance to describe his working methods. For me, that section alone is worth the price of the book.
The book, by the way, was published in 1975, and when you read the essay by Robert Silverberg and marvel at his productivity and awards and marvel at the wonderful books he wrote, just think of this: He's continued to produce fine work for all the years since then. And then think about this: He doesn't even mention that he was writing two books a month for the soft porn market during some of the time he talks about. He didn't come out about that until a good many years later.
For someone of my age who loved SF as a youngster, this book is fascinating reading. Highly recommended.
Update: Todd Mason has some excellent comments on this book here.