They roll incredibly smooth and grip incredibly well even descending fast on mountain curves. While others get pinch flats, I always keep rolling. Incredible system. That said, I get six months out of these tires in the desert southwest. My previous set up was Continental Gatorskins and those would last over a year, but when you compare the ride, there simply is no comparison. They end up costing almost twice as much but I get the return in comfort, handling and speed. Never had the defects they describe in over four sets so far. Won't go back to tubes.