I use this earphone personaly from last 6 months and its working very good. And no doubt for its sound quality because just name is enough sony for sound quality and really sound quality superb for this earphones. And extra bass gives you advance music and also crystal clear volume but in some mobis may be sound not so loud. But if you have sony, samsung, micromax, htc or have a iphone that go for it. Its for you very good quality of sound you will feel. I like this earphone best in class what earphones I used before. Its best.