The quality of the sound for the microphone and earphones are great. The battery is giving long lasting performance between charges. When moving your head down the headset intends to fall from your head. This might need to be improved by a different shape of the earphones.
Long duration between charging
Continuous notifications of firmware update which can't be processed, When switching on the volume always goes to the maximum level and you have to return it to the level you want; Why not able to keep it on the same volume level