I have used sony MDR-XB series earphones/headphones for a long time .. I have used XB-30EX, XB-55AP, XB-650BT I just got one issue in all the sony products that they don't last long more than a year. Even my XB650BT which costed me approx ₹6000 last october(2017), started giving me issues on its right speaker. So my openion on JBL C100SI is that YOU CAN DEFINITELY PURCHASE THIS PRODUCT..! The reason for this is because u can't find any difference in SOUND QUALITY/BASS/SOUND CLEARITY between double/tripple time costing any other product than this JBL earphones. I am using this earphones for more than 4 months and they just sound like my old sony earphones but @ just half the price range. So i suggest you to choose wisely what you need.