I have tried using In-Ear type Bluetooth Handsfree devices only sticking in your ear, always fall out.
I use over-the-ear , with glasses! , they stay in but sometimes easily shift/not always comfortable.
I have used Plantronics Voyager Pro, batteries failed after a year, got new Voyager Pro+, now the batteries are failing with these too!
The sound for me is good, but sound from me is not so good for the other listener when I am driving.
The microphone is facing...