I've been fascinated by Picasso for years, and if there's a better biography than this I haven't found it. With a character as complex and contradictory as Picasso, 'the truth' is always going be a slippery concept; but this book builds a completely coherent and more plausible picture of the man and the artist than anything else I've found. And it's very rare to find a biography that's so authoritative that's also so entertaining and so readable - I frequently found myself laughing out loud.
Negatives? It's a biography, not a guide to the work, so there are no photographs of the paintings, sculptures, prints... I found myself reading it alongside books that did have the illustrations, or making notes of pictures to look at later. And for some people, O'Brian's conversational style may feel a little old-fashioned; personally I love it, but this is clearly a book from another era.
I managed to find a hardback first edition through marketplace. I have a handful of books - a dozen? twenty? - that I know will be friends for the rest on my life; this is clearly one of them.