I’ve had the Sparks since May. My top priority was comfort, and I’m 100% satisfied. I completely forget I’m wearing them—even when I have sunglasses or a cap on. I brought out my beanie this morning, and they’re still super comfortable, plus I can still use the touch controls.
I control the volume on the left, and track skipping and on/off functions on the right. The sound quality is perfectly acceptable. I haven’t tested the sports features, apart from the metronome—the sound of which is loud and grating.