@Ully: Yes that's my question too, but the result shown looks pretty OK although I think only the experts in this field could be the final judge of the quality.
My first feeling was remembering the very first scanner I could afford to pay, which was a (lousy) hand-scanner which it was almost impossible to get a straight scan with. However, that was somewhere in the mid 90's IIRC and it's 2012 now. There's a guy on KLOV forum who claims some of his patents are used in the device......there must be some clever software in the device that compensates for movement differences.
@Zorg: OK but Roseta won't run under Mountain Lion. Of course it's possible to make a dual boot, or have it work under Windows using Parallels, but direct support is always nicer of course. Wouldn't be an issue for me really because I'd use a Windows laptop to do the scanning if I would have had one of those HP scanners anyway.
I'm not doing a lot (if any) artwork scanning, but I'm looking for other applications for this device.