An interesting book; it’s much less an autobiography than most, but it’s not a normal collection of short stories either. It’s more “you already know most of his sci-fi, here’s his rare stuff”.
He sounds annoying to deal with, particularly during his lashing out as sci-fi phase– but I enjoy his stories and articles. His lucrative time writing for holiday resulted in some interesting interview with sci-fi authors– which might help explain how they sci-fi authors penetrated the mainstream.
If you already love him, this is interesting further reading. If you’re not familiar with him already, start with his novels The Demolished man or The Stars My Destination.