Who has used the RealEbook/writer website?

This site looks promising:
http://signature.realelibrary.com/index.php/library/
Download free software, have kids create books and they'll post the book on their website. You can print the completed books, or they'll print and mail it to you (not sure about the cost is on the printing services)
I'm wondering if anybody has "really" used Realbook/writer in their classrooms?
Has anyone had the books printed and mailed and how much did each book cost?

-Michelle TG