Summary: I made this particular purchase because I'm a tinkerer and this was for a lot of 6 for parts or repair. In fact, they all work, some with minor issues. In defense of Ambir I must say the only experience I have with their scanners is with used units. Keep that in mind. I also have a DS 485 that I reviewed and I don't see any difference between it and the DS 487. I had a job in which I carried a laptop, printer, and scanner in a back pack.