Apparently Azimut doesn't do stairs, but it's quite adept at dragging lazy frenchmen around in their office chairs.
What scared me is that it took 2 guys to lift it off the pedestal... ooof!
It's basically a hybrid of the 4-point omni-directional movement approach (ala Taurus2, etc.), coupled with the split-track traction you see in a lot of today's robots (usually a triangular front section that can move up/down to climb obstacles).