These headphones are ok.
They have a great battery life and a good sound. They remain deep in your hear all the time. I use them for running without problems.
they have design issues though.
1/ the buttons are stupidly placed.
Basically when you want to skip a song or change volume, pressing the button will crush the bud in your hear, which is quite unpleasant..
2/ there is no battery indicator. When running low the device will emit some warning sounds merely 10 minutes before dying. That is by far too little. It's even more vexing that a charge lasts me a good week. So I cannot predict when the thing will die on me.