We bought the first book in March, and my son loved it as soon as we got it. He was not interested in learning ASL until we started using this book. I couldn’t wait to get our hands on the rest of the books. My son has studied the “I Love You” book so much that he knew right away what was in the new shipment of the rest of the books. Everyone I have shown these books to loves them: friends, teachers, therapists, etc.! My son is three years old and reads this book set by himself. He will do independent play and started with the red book, and as soon as we got the rest of the series, he started reading them all on his own. He is learning the ASL words just by the pictures and is starting to actually vocalize his words from the sound board. Thank you so much for these fantastic tools!