I read all these reviews for this earpiece and had great hopes for it. the LG I tried a couple of years ago had really poor sound quality and was very uncomfortable, so I've stayed away from bluetooth headsets. When I read the reviews on the 510 I thought this has got to be better. Well while the headset is very comfortable, the sound is very muffled. I'm returning mine. If you decide to order one I hope you have better luck.