Have a pair of Oticon Deltas. The amplifier is behind the ear connected to the speaker which is in the ear (inside a latex cone). They are almost invisible and the sound, when working, is quite good. However the speakers don't last in the hostile environment inside the ear. About every six months they die out and the warranties to replace them are expensive. My next pair won't be the inner ear variety. They initially cost around 4k.
I don't wear them riding or any outside activity. I use them mainly for work and meetings or watching TV and movies. It's great when flying. I take them out and don't hear the babies crying.