I also think it's a great tool to allow the child to become independent of their parents, and to delve into a book or having their stories before falling asleep without the need of the adult.
If this pen can teach the child to be autonomous, pen, he does not work without parental supervision: parents must open an account on the site Leapfrog allowing them to download the necessary data to the interactivity of each book. It's simple but essential.
Nevertheless, I agree with the comments of other reviewers: the book comes with this book Leapfrog is a demo, which serves more than showcase and advertising for other books in the collection, it will obviously buy separately. Finally, I find that the catalog is not very full, and there is little choice between Disney stories and discoveries-some educational booklets. For the latter, it is a good start, but the catalog of stories could be really more developed and varied, and offer books a little more ambitious (tales, etc ...).