John Kobal compiled his conversations with more than 40 film industry luminaries, from the very famous (Mae West, Katharine Hepburn) and the less well known (June Duprez, Jack Cole). Directors, choreographers, actors, photographers; Kobal doesn't just concentrate on one aspect of the art of film. There are some people who could have been skipped, simply because their stories were told more fully elsewhere, and others who are welcome simply because of the rarity of the experience of hearing from them.
For all of this, however, these are very much "interviews," as opposed to personal conversations. These people are practices at the art of telling what they want you to hear and nothing more. Many of the conversations have the feel of a press release. For instance, Joan Fontaine completely poo-poos the idea that she and her sister don't get along (despite photographic evidence to the contrary), but then writes her own rather scathing memoir, several years after her interview with Kobal, discussing exactly that fact.
Also, it was impossible, at least for me, to read more than two of these interviews at a time without them running together. This is more of a reference volume, to be dipped into on occasion, rather than a compulsive read that you can't put down. If I tried to binge-read (which is one of my favorite ways to indulge), it didn't take long before I couldn't remember who said what.
All in all, I'm glad I read it, but I can honestly say that I remember very little from the first interviews in the book, and even the final one is already fading a bit from my memory. It just didn't stick with me as I hoped it would, despite my basic enjoyment of the content as I was reading it.