Just finsihed the book; yes, I agree that "Open" is a good read, much better than Sampras' book I thought. (Strange that these 2 books should reflect the players' personalities; Andre's book was colourful and lively and fun, while Pete's was just plain "boring", factual but nonetheless informative). Both are good reads though, just different.
Something new I learnt from reading- it was Brad Gilbert who initated the split, and not Andre; I've always mistakenly thought that Andre "fired" brad to take up Cahill as a coach, but this was in fact not the case.