He's dedicated to his sport, hates publicity and is very down to earth. Compared to other autobiographies, this book is not as interesting. But, then again, he's still very young and hopefully there will be a few more chapters about his future success.
If you are really into Rugby, I suppose you will love this book, but if Rugby is just a mild interest, it will not be as good as read as I hoped it would be. Saying that, it will demonstrat the dedication and focus you need to reach the top. So, for aspiring Rugby players, buy it!