Nice idea, don't think I've got the patience to turn the pages of a whole book so it can be scanned in and have it read back to me (presumably you'd want to do this if you were going away rather than taking a book and the device with you).
Niche market really though.
Hopefully it won't be adopted by schools, so that kids actually still learn how to read for themselves.
EDIT : Oh and its a tad pricey at present with a retail price of £999 !!!