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.
Summary: Great sound quality, and fantastic design to help them remain in the ear while running. I prefer my earbuds jammed right in the ear canal; so every couple of kilometers I just have to push them back in a little, but they'll never actually fall out of my ears. Cord length could be a little longer but works well when using an armband for your device.
Summary: Very disappointed with these earphones, i workout a lot and i found these earphones did not stay in my ears, i tried different earfins but for some reason they did not seem to fit in my ears properly.