My 8 year old son (ok...me too) is a huge Odyssey fan. He listens to an episode or two every night at bedtime. And he's got many of his non-believing little friends hooked on the show.
He was THRILLED when he got the Guide Book! He fills me in on details about all the characters and back-story lines. Regularly. And thoroughly. Well, it's a good thing that I'm a fan of the series myself...it beats hearing of Pokemon battles and damage points!
My 11 year old niece was beside herself after I gave her this book for her birthday. She could hardly put it down to open her other gifts. She wanted to learn all about Odyssey, how they started, how they created the characters and more.