Biggest issue is fitment. Movements that jostle the earbud even slightly will trigger the sensor making the earbud think I've removed it and cause audio playback to stop. This is most apparent when I wear them while doing any kind of physical activity. The touch inputs are also inconsistent. Sometimes there's a lag when I tap to play/pause, causing me to tap a second time because I'm unsure if my first input worked. Other times, something as light as my hair brushing the earbud will trigger it and stop audio playback.