I've gone through about 5 Bluetooth headphones and these have the best sound quality. The in-ear silicone piece is excellent very comfortable and doesn't slip out of my ear unless I really do some serious head banging. But the headset feels and looks cheap. I think it's a bad design. Very dated looking. Also the power slide button isn't real decisive. On many occasions the button was inadvertently moved to on when I didn't realize it and drained the battery.
Though it has outstanding sound and is great for using for phone calls, listening to music is fraught with peril.
It constantly drops the bluetooth connection and when the connection recovers, music will not play through the blue tooth headset until you 1) turn it off, 2) turn off bluetooth on the phone, 3) turn bluetooth back on at the phone, 4) then the headset, and then 5) maybe within 10 minutes you can get music out of the headset again.
It is strange because during the music outage, it still works great for phone calls and also works great with the Mac Book Pro and iMac without issues.