My 2 cents. I was highly impressed with the concept and purchased the said haldheld scanner (same one as OncTech, $99). I was interested in copying various library items such as photographs from rare old books (for non-commercial purposes from out-of-copyright books). Unfortunately I was not impressed with results. I had much better luck when I tried to scan single unbound pages though. However, that was not the reason I bought the scanner in the first place. I returned it after about 2 weeks.

I think it is a great piece of hardware and performs very well, as advertised. However, make sure you have a firm idea for its intended use since it is useful only in specific scenarios.

Hope this helps.