I first read this book about a decade ago, when renewed interest in synaesthesia brought it back into the light of day.
It was great to reacquaint myself it.
Cytowic has quite a disarming style of writing that keeps you thirsting for more information - and he rarely disappoints.
As you read the free flowing prose you naturally find yourself asking more and more questions. Unusually for this type of study, the author manages to oblige you with the answers more often than not; then, infuriatingly, pose some others that you hadn't thought of in the first place!
More than just a good book about synaesthesia, this is simply just a good book.
I would recommend this title to anyone with or without an experience of the condition. It is informative and uniformly fascinating. You will care far more about Cytowic's 'characters' than you ever would about John Grisham's or Jilly Cooper's.