A neat application, indeed - but there is definitely something to find flaw with: it is purported to provide the ability to route arbitrarily large pieces at a very low cost. However, a human operator is not like a gantry-style CNC router, they cannot simply "fly" over the work area. Typically, must operate the router in a "push and pull" fashion to maintain control. A human would become weary very quickly if you put them in a harness over a 50-ft piece of material and forced them to push and pull with their arms hanging below them. Finding motors with enough torque, but not so much to put the human in danger (you wouldn't want a software flaw to push the router in a dangerous direction without the operator being able to override it with their own physical strength) will limit what bits and materials the process can be used on. Granted, I'm fairly certain few are expecting to CNC route metallic materials by hand. =)

Overall a cool new application - I find the display on the screen one of the best features, and, in fact, I'd kill to have something like that -without- the motor correction. One could, with some work, replace the motors with encoders attached to spinning shafts, which were limited in which direction they could spin, and get rid of the tape - simply showing the user that they are following the pattern or not.