None of the in-ear headphones I have ever owned have ever worked for me. They always fall out of my ears due to how my ear-canals are formed.
But after 6 months of use I can with 100% conviction say that my OpenRun Pro's have been the best all-around headphones I've had.
They sit perfectly on top of my ears and the bone-conducting plugs allows me to do sports, hike without all the time putting the plugs back in the ears.
I'm a huge fan of this tech!