What good is riding the tire without getting flats, if you have to spend more time fooling around with it than if you were getting lots of flats in a conventional system? You're trading the chance of a small inconvenience for the certainty of a larger one.

If your riding time is scarce and precious, but basement lurking time is plentiful, I guess I can see the appeal. You probably won't have to mess with it while you're on the trail. But you will have to mess with it, both when installing the stuff and again every so often when you take out the curds and whey-- and that's true even if you didn't get any punctures at all.