My experience is very similar to many other reviewers. I've owned a green pair and now I'm just replacing an orange pair. Both stopped working in one earpiece after about 12 months. They were well-used (running about 30 miles a week) and were comfortable and stayed on (even when doing fell running). The sound is reasonable for this kind of headphone (but of course nowhere near as good as my over the ear Sennheissers).
So they deserve 5 stars for the first 12 months. They fit well, are comfortable, don't fall off and give reasonable sound. Then no stars after that as they give up working in one ear. My hunch is that the problem is moisture - i.e. sweat. This starts gradually with… Read more