Hi Dale,
I'll clarify that I wouldn't use these portables for running or going to the gym. However, walking and commuting is totally fine with minimal slippage imo. I've had other 'on ear' headphones and after about 5 minutes my ears start hurting and therefore I don't wear them (in the process of selling the AKG's).
Anyway I've compared them with my Sennheiser HD650's, Mr Speakers Mad Dogs and they SQ compare quite favourable. In fact they are more comfortable with less weight on my head.
Cheers Rod