First time I buy headphones of this kind.
They did not cover me in terms of fit and comfort. At high volume, the headphone vibrates quite a bit and it's a bit annoying. Also, someone can hear the music when it's at high volume because it's like speakers.
However, during running and cycling, the music playback is fine.
During calls, the person I'm talking to can't hear me, so either they have a problem or they are not suitable for conversation.