Yeah some are VERY LOW quality. I haven't had any problems w/these. I sell about 400 a month now, and every month I only get about 5 complaints, sometimes less.
These hold a charge for about 5hrs and the sound quality is good. I will admit though, that if you get different headphones than what comes with them, sound quality DOES improve.
When you buy these in the future, even if not from me, always make sure that what you're getting is FCC and CE approved. This ensures you will be getting good quality products.
Mine, of course, ARE FCC and CE approved!