I received a pair of the more expensive Apple In-Ear Headphones for Christmas. I used them around the house and thought the sound quality was pretty good. The trick to getting optimal sound seemed to be to get them properly seated with-in your ear canal. So a few weeks ago I decided to put them through their paces at the gym. The first thing I noticed was they tended to fall out of my ear while doing cardio (elliptical). This was frustrating because I found myself having to continually fiddle with them to reseat them or put them back in my ear. Even though an elliptical is low-impact, I figured it was the continual motion that was causing them to fall out. Next I moved onto free weights, again issues with them falling out. I even tried flipping them upside down and wrapping the cord over my ear. No luck. I came home and decided to try the other tips (small and large), neither helped. I think the design of them isn't conducive using them while doing any sort of physical activity. Figuring I was now out of my return window I decided to try to live with them. Flash forward to yesterday, I again was working out and noticed the sound in the left ear bud was becoming static-ey. At first I thought it was the song...but then the next song came on and it began to cut out. I'm fairly certain they're ruined - I'm hoping they have a warranty. So lesson learned. The Apple In-Ear Headphones work well for around the house or walking around - but I wouldn't recommend them for use during any physical activity. Assuming these will be replaced by Apple, I plan to put the replacements up for sale and find a different pair. Ugh.