Using true UST tires and rims I've dropped 8' to flat on only 25psi (2.4" Specialized single ply tires) numerous times. No burps, no tires blowing off the rim and no pinch flats. I've finished numerous rides where I've pulled at least 5 thorns from each tire. All that happened was a momentary misting of Stan's fluid as it sealed the holes. $15 stem is a one time purchase. Same cannot be said for a $3 tube. I too can see the benefits.