My only complaint is that this book gives no proper respect to the excellent movie version; it refuses to allow for the differences between the stage and the screen. (Note: I did see the 1979 Broadway revival, as well as high school productions, and have enjoyed the movie umpteen times.) Otherwise, The Making of West Side Story is highly recommended.
I read this because I am writing teaching materials for business execs to study, as a case of effective, if unorthodox, management. That is only one of the many many levels n which it can be read. The author offers a wonderful panorama of the dance, music, and acting that was current - and changed by this musical tradegy - at the time.
It appears that Garebian used only written sources to write this. As many of the participants were alive at least during the lat decade, this limits the account in unfortunate ways. But is it well written and a spur to read more elsewhere.
If you are interested, I would recommend this. If not, go to the biographies of the participants. Nonetheless, it is a solid view into a unique collaboration.