If you are the GM of a Fantasy HERO game, or really any heroic level HERO game that would benefit from monsters, you need this book. It is far better than any of the official bestiary, and includes many classic RPG monsters as well as a host of original creatures that will give you plenty of ideas. The art is rather naff, if charmingly old school, but that doesn't matter because what you care about is the write-ups, and they are very well done. The creatures are presented one to a page for easy printing, the mechanics are well done, and the background information given is actually useful.
TL;DR: This book is an essential for any Fantasy HERO GM's library. Buy it now.