At work we have a Polaris sxs that came with a set of the non pneumatic tires. This thing has about 500 miles on it. They didn't rotate them every 20 miles (or ever) but the rears are shot.
I guess you won't ever get a flat, but evidently they wear like an ice cream cone on a Tijuana Saturday night.
Yup- they've been smoked non stop for those 500 miles.
It is pretty evedent from the photos that the "rear tires" where abused. they even have visible hot spots... most likely from spinning them excessively...