Read this mostly to Zane (6), whose sprawling menagerie of stuffies guaranteed he would identify with StingRay, Lumphy, and Plastic. It took a little longer than I expected, but he eventually got completely wrapped up in the story.
Zane liked this book a lot more than I did, but it was sweetly funny and kind and gentle, so I can't complain if he paid attention at all. The lack of space aliens, monsters, or evil bad guys may explain his initial coolness, but every kid wants to believe their toys have a secret life, talking and cavorting among themselves when we're not looking. (It's kind of a kid's job, in fact, to give voice to that life—and Zane does great voices.) Once Zane connected with the characters, he was engrossed.