What I Dislike: Although a cute concept, I tend not to like children's books or programs that intentionally use mispronunciation. As a parent of a child who receives speech services, I think it is very important to model proper pronunciation.
Overall Rating: Despite all of my issues with the book, my almost-2-year-old laughed out loud in places and proceeded to spend the rest of the morning carrying Thumbuddy, Thumbuddy, I Love You around and saying "thumbuddy." For that reason, I can give it a "Good" rating.
Buy it at Amazon.com for $8.95.