Not "famous" or "great" or even "best" - this book offers a bevy of people the author names as "extraordinary." And by using that term, Hearst allows himself to add some fascinating - but also nasty or controversial - people to his book of mini-biographies.
Many of the people in the book you've heard of previously, but there are sure to be a few surprises. I'd never heard of smokejumper Wag Dodge, and his story is extremely interesting. And I'd be scared to stand too near Roy Sullivan, who was struck by lightening an amazing SEVEN times during his life (even his wife got hit once!).
List books are always subjective, and the author of this one does a great job of turning his "authority" into a running joke. He inserts himself and his opinions into the book, daring you to disagree with him and offering contact info if you'd like to convince him of your viewpoints. It's a fun, casual book with lots of great info - I'll be recommending this one a lot in the library.