I tried my first experiment with it tonight. Didn't go so well, actually....
The scan seems fine. To cut, I taped a piece of Tamiya masking tape onto an index card. It didn't make a very clean cut. It was fairly small numbers - turret numbers on a 1/35 tank.
The main problem I have, it seems, is getting access to the machine :-)
I'll try adhesive vinyl and see how that works.