I bought these to replace the Sennheiser PMX 685i In-Ear Neckband Sports Headphones which were very painful on my left ear, see my review.
Fair play to the apple store in Bromley, as I took the first pair back and explained the situation and they exchanged the headphones with absolutely no quibble. I now have 14 days exchange period on these.
Sadly, I will have to return these too. Although they fitted and sounded great whilst staying in place, they were painful on both ears, although not as bad as the neckband ones.
I'll keep trying to find headphones that stay on when I sweat and are comfortable