I love these headphones because they are one of the better designed stereo bluetooth headphones out there, small, lightweight, and discreet. Now for the bad news: they tend to fail after moisture gets inside of them. The buttons on the side stop working soon after you complete a workout. This is a sad truth about them, as they are ideal for exercise. I have owned 2 and they both failed the same way, so I am very familiar with their shortcomings. Overall, they work and sound good, but beware about using them during any activity that may induce sweat, as they can be very fragile in that regard. If you end up buying these and use them during such activities, dry them frequently and immediately.