We got this book when my son was 3 months old he is now 20 months old.
This book puts him to sleep every night, and I know when he is awake in the morning as I can hear him turning the pages, and he is having a conversation with scout (Just wish I knew what they were talking about!!) We love the feature of 5 minutes or 10 minutes on the lullaby and the lullaby is not annoying but actually relaxing and calming.
It is fun to watch my son learn that there is more to the book if you push the button multiple times on the page - We did not discover this right away. He got a tag junior for Christmas so we are going to show him how his tag junior can work with the book.
My issue is that it has been used so much that I cannot keep batteries in it, currently the sound is getting crackly, but that could be the batteries again. I have read other reviews that have the same complaint after multiple uses the sound gets crackly or goes away completely; I hope this does not happen.
Only wish there were more books like this. I have the farm one (I don't like as much, it's kind of boring), but there needs to be more. I would own the entire collection.