Yeah, they have to say that. I know for a fact you can tell when run flats have a puncture without a sensor. Because I have run flats, and the $150 sensors are gone from three of the tires due to one inexperienced droid at the place I got my last set. Crushed the sensors removing the tires. The car starts to pull toward the side with the flat tire. Once you feel that, just get a guage and check. Easy.