Excellent book! My 5 and 6 year olds love it. Storyline is entertaining and keeps them interested. It has great illustrations, however some text illustrations are written really small and hard to read, and are kind of chaotically places throughout the book. If I could change anything about the book it would be that. It came in one day which was great! We originally heard of Arnie because my sons 1st grade teacher read it to the class. The kids loved it, that prompted us to purchase it for the kids.