In less than two years, five purchased pairs and three replacement pairs have all failed in the same way. I purchased six pairs of these earphones for myself and my young adult children at over $120.00 each (with taxes) at the Apple Store. Within a year, three of the sets had lost the sound in one earphone. Klipsch was great in sending replacement sets upon proof that the failed earphones were less than one year old, however, less than a year later, all of the sets (except mine) have the same problem - no sound in one of the earphones! Sooo, if you are buying these for yourself and you use them very carefully, they will last and you will be happy, but if you buy them for your children or active young adults, save your money and buy another brand at The Source and get their replacement warranty. None of my children use Klipsch products any more. I believe that the issue is with the jack. A sturdier or a 90 degree jack would put less strain on the wires at this obvious weak spot in the design of these otherwise great earphones. If you use the right size ear tips (the earphones come with four sizes) they will stay comfortably in your ears and you will be amazed by the sound. I wish I could rate these earphones higher, but with such a high failure rate I cannot.