I have used Stans for years. I also tried that Caffe stuff that foams up but that doesn't work for larger holes. I gave this a shot since they claim it does not clump in your tire like Stans does. Well, it's true. It outlasts Stans and when it comes time to refill your tires, it leaves no rubber clumps likes Stans does. Conti got me hooked on their Trail Kings (running Mountain Kings now for the snow up here)and have now hooked me on their white stuff. Even the top is no mess as it fits directly in the valve. Great job Conti!