Conclusion: I recommend these headphones for running and other high-impact forms of exercise. They sound great, stay secure in your ears, and are very durable--probably the best running headphones I've found, and I've tried a lot of different brands and models.
Conclusion: I own the Sennheiser CX 685 ear buds and Sony MDR-EX210 ear buds. The Sennheiser sound better than the Sony. But both of these do not stay in my ear at the gym no matter which size buds I use. I purchased this PX 685 so I don't have to worry about that any longer.
Conclusion: I've recently purchased this headset and I have to say, it is extremely awesome !! I can turn the sound up while in a quiet library and it cannot be heard AT ALL. I did a test just to see how loud I could turn it up without it being heard because I've had headphones in the past that you can hear...
Conclusion: Ear buds don't fit in my ears so running with music has been impossible. This product works great for me. It stays on my head when running and the volume adjustment, stop music, skip song option is great and easy to use while running.