We purchased the entire set for our daughter, and so far we're very pleased. She is only 4, but listens to the stories intently and asks questions about the characters. It has given us an easy way to start talking about big issues without being overwhelming. I think she'll continue to enjoy these books, and learn more from them, as she gets older.
I would highly recommend these for any parent looking for an easy way to introduce and foster the ideas of liberty and freedom to their kids.
