I'm impressed with them. I tried the first gen and they would not stay in my ears. I had heard the second gen stayed in your ears better, and I figured that was BS. I tried them anyway and they really do stay in my ears. I'm constantly checking them, figuring they've slid out a little and they never do. I don't know if it is the shape of the tips or if they changed the material they are made of, but they actually stay in my ears. I fully admit that I'm waiting for the honeymoon to be over. That maybe after a month of use, the tip's surface will change and then they'll start coming out of my ears.