I had an earlier version of these headphones (C300) and was very happy with them but the C310 was a big disappointment. The first set broke on one side on the second tightening and they were replaced under warranty. The changes made to the C310 reduced the quality significantly; the sound is tinny and not nearly as good as the earlier version, the placement of the plastic pods with battery and volume controls have been changed, causing the cord to shift to one side of your neck when you run…