These earbuds burrow into your head, which won't suit the squeamish.
The battery/noise-cancelling box is on the large side considering it takes a single AAA cell, while the price seems optimistic. But there's also a lot to be said for these JVCs.
The noise-cancelling is effective (if reminiscent of sudden cabin depressurisation).
The sound is solid, too, with some separation and breathing space to music, even as it's injected directly into your head.
Bass sounds are well controlled, though slightly monotonal, and the JVCs fight against listener fatigue well.