In my opionion it is worthy of 5 stars because it has everything you need. I missed a "clear" button until I got used to using the "shift" and "back" buttons. However, in most cases you can just go onto your next subject. I would recommend this to my friends and all crossward fans.
This is an excellent book for children but if grown-ups are reading this to their children then they will also learn something about the environment. A nice story with a message for everyone.Kaitlyn and the Moonman