One of my good buddies/co-worker is 95% deaf in just one ear and I ALWAYS forget to position myself to talk to him correctly. He adjusts, but I'm usually half way through a sentence before I do an ohsh*t.
On another note, I brought in the Aftershokz to show some of my co-workers who use headphones. I was pretty surprised that each and every one didn't leave it on their head for more than a few seconds. Some were just stunned and immediately took them off. I believe it was do to the slight 'buzz' feeling. And that only happens when substantial bass is in the song. They all had that weird look on their face.
I just thought it was an interesting observation, and now kind of an experiment.