The sound quality is fine but one thing I noticed is that the touch control on those earbuds are really hard to use. Moreover, I always accidentally press the button when I try wear them.
As for connectivity, I don't know why but on Android device (Samsung Galaxy S10), the earbuds connect fast and easily the first time and for the rest of the time.
But on iPhone, the earbuds need to be paired once again after using few times, especially if you switch between your phone and Laptop. If you switch regularly between devices, the earbuds will not reconnect properly to the iPhone X. You will need to activate bluetooth, click on "Forget this device" - and pair it again with your iPhone.