It's a superb book - interesting, well researched, easy to read and, above all, provides a background for understanding how Carmack and Romero each ended up where they are now.
+1 - This book actually rekindled my love for gaming and reminded me of the passion for computers that contributed to me deciding to become a developer in the first place.
Also shatters the popular idea of Carmack as a nerd (he breaks into a high school and steals computers as a youth) an Romero as a bro (he's writing a bunch of games, compression tools and other useful bits and pieces)
