I've got a wonky cauliflour ear from BJJ... it's not too bad, but it means that I can't wear in-ear headphones as they just fall out of one side.
I was looking for some simple cheap headphones that I could use to run with, and I found these. They werent expensive so I took the chance. Suprisingly, they have stayed in on every run so far, no problems. I was a bit concerened as they aren't a 'snug' fit, and I'd personally prefer them to be tighter, but they have more than done their job.
Even when I've been running hard and sweating heavily, they've worked fine. I know this is an issue with other headphones.
Sound quality is ok, nothing to write home about, you get to hear the music without any major problems.
For the price, the overall quality is great, and they are very good value for money.