No man, they are not bad for you, they are bad for everyone. The fit is awful. They do work much better with cables up, with cables down not really decent fit, at all.
Sound quality, they cost 25€ shipped, sound so so so much better than a 40€ sony. The sony now sound as if they are 3€, or less, and the blon, when they fit... they sound so much better. So the blon gives trust on the iem sound potential, but boy, they fit so bad. Mine leave always the eartips inside my ears... I really hate them, they are sueless.
I wonder if 140$ for the Fiio FH3 would be worth it, in fit, and worth it in sound upgrade...