If you have any interest in Roger Corman's Poe cycle (I rank these cult classics on the same level as the best classic horrors from Universal and Hammer), this is the book you have to own. It contains Richard Matheson's screenplays for the first two films (HOUSE OF USHER and PIT AND THE PENDULUM) in their original form, so you can see that some slight changes were made while the filming. In addition you get two well written and very interesting "Making of" articles by Lawrence French for these two films including many fascinating photos (some behind the scenes stills among them), a foreword by Roger Corman himself and an afterword by Joe Dante.
My only complaint is, that the promised "Volume 2" (which would have contained TALES OF TERROR and THE RAVEN) was never published so far. I'm still hoping...