Excerpt: I'm not the sportiest of girls, however, I love to hike, going on long walks, and the occasional run, too. When I go for runs I use music to power me through the tough times, and when I hike I like to make like Rocky and use a motivational track to push me to the top. During these times, there is nothing worse than the feeling of your earphone progressively falling out of your ear. With every step you can feel it getting looser and looser.
Summary: Bought as replacement for a previous set which turned out to be a slightly different model - CX680's. This replacement set is dreadful. The buds aren't buds, they're flat disks that don't go in my ear at all. They're simply too big. If I manage to wedge them in then they fall out as soon as I move my head slightly. Now looking for another set of CX680's and hoping my old ones will last until payday because these MX680's are rubbish.
Summary: These earphones produce an excellent sound, if I could only get them to stay in my ears. I've tried with fins, without fins. One of the housing rings has snapped because I've had to take stuff on and off in order to try and get the system to work. I just can't get away with the fins, no matter which size I try they just won't go in my ear far enough to get a decent sound. The earmuffs just fall off anyway so they're useless.