Mark Bellomo is the man when it comes to GI Joe and Transformers. Every picture inside (and there are hundreds and hundreds, all full colour) is from is own personal complete collection. Every figure from the North American G1 line is included from 1984-1991. Every figure's file card and tech specs is transcripted inside. In addition, Bellomo adds his own details -- character traits from the comics and TV series, comments on the figures, variations, etc.
The only thing about this book that I don't find terribly useful is the price guide. While only a few years have passed since this book was published, as a collector, I'd have to be incredibly lucky to find any of these figures for the prices inside. eBay is now a more useful pricing tool.
I can literally leaf through this book for hours. It's fantastic. Not only does it bring back a lot of memories, but it's a great guide book for piecing together a complete figure.
I hope a second edition comes -- I would like to see G2 added.