Wow. Went on a limb to put these on my last wheel set thinking it was more gimik than legit. Suprised to say, 4000 miles and no flats. I broke about 16 spokes in that time, and retrued the rim thrice from taco... these things are probably the best addon for a bicycle. Saved me countless times. Scars all over my tires, half-dime glass thorns... and still ran true.
The tires wore out before the tubes.
You could probably get some cheepy tires and these and have the same fortune.
Although, I recommend getting a really good kev. tire set, a pair of these, and a tube size one smaller than what you run normally. This way you avoid pinches due to the extra girth.