I bought one of those for work a while back. I am a civil engineer so the fact that you can see through it at what you are scanning was a big feature for me because of how often I deal with 36"x24" blueprints. With this, I can easily scan a blueprint with a series of scans and then attach them together with the included software. A scanner that could do this in one scan would of cost thousands, so like I said this was a big selling point for me. I could see how this would be nice for large arcade graphics also because you could hold it right up to the cabinet and see exactly what will be scanned each time you hit the button (think picture frame with just the glass and the frame and a cord coming off of it).
The only downside that I found was the software they include to attach your scans together really didn't do a very good job. It got easily confused and didn't seem to be able to rotate images where it was needed due to slight differences in how I held the scanner from scan to scan. This really wasn't a problem for me, I just attached them together manually with photoshop.
As far as the quality of the scans, I really can't comment. What I was using it for really didn't require much in the way of resolution so I wouldn't of noticed one way or the other.
HTH
