Not for Running
Bought as ipod replacements. May be OK for sports that don't require much movement but terrible for running. Every stride, every breath and every movement in the cable comes though to your ears rendering the excellent sound quality you've paid for worthless.
You have to use the cable clip but they still worked themselves loose so I'll be going back to the standard ipod earphones for now.
My opinion is probably true for all earbud type headphones used for running but I will stick with Sennheiser for my next purchase as the sound quality is far superior to the standard ipod set.