Rosenblum edited feature films from the late 50s until early 80s, and is most noted for his collaborative efforts with Woody Allen in the 1970s. But his most interesting stories in the book are from a decade earlier when he was still experimenting. Though, I have only seen about half of the movies Rosenblum writes of, it makes the stories no less fascinating.
Rosenblum's major accomplishment in the book is to shed light on the importance of the film editor in motion pictures. He's not wrong in stating that their efforts have been largely ignored by critics and the public at large. What's interesting is that the editor as an influence in film is rarely even discussed by film critics and historians. It's probably because people are largely unsure of what an editor's true contributions are to any one motion picture.
Through the course of the book, Rosenblum takes apart THE RAID ON MINSKY'S, THE PAWNBROKER, and ANNIE HALL in depth. He also gives examples of how much an initial cut of a film can differ from the final cut.
I found the book quite informative, and learned more about film editing than I had expected.