I take them out running once a week or so and they've been great. They truly eliminate all exterior noise and let you to focus on the workout. Like many other bud style headphones they come with adapters for different sized ears but the stock ones worked perfectly for me and have never fallen out. So far the stock pieces have never come off the buds either. Only complaint would be that the cords get tanged easily but I have minimized that by coiling them up when i put them in my pocket or backpack.