I played around with the 700 version of this, was not impressed. First of all, you need an absolutely flat surface, secondly you need to make sure it goes over the image completely flat (so it won't work on books or magazines), it also tends to slip to an angle when you drag it over the image (which meant that it didn't work well on glossy paper, and then there was the quality; it sucked.

Nowadays I just use a digital camera, their resolution is much higher than any of these handheld devices.