I wonder how they would look and feel as well, but I haven’t tried them.
A couple of other thoughts about them occurred to me after I posted. I think the user might need two of those loops, one for each ear. If you do need two because they’re short, one loop goes through the piece of the BTE HA in back of the ear and the other loop goes through the eyeglass arm. If they’re long, one loop goes through both pieces on the right ear, and the other loop goes through both pieces on the left ear, and the keeper runs behind the head. Looking at the image, my best guess is one keeper is needed for each aid, but I’m not sure.
The other thought is a good news/bad news thing. The good news is that using the keeper might sharply reduce the chances of forgetting to remove BTE HAs before getting them wet. It’s not unusual for people to get so used to BTE HAs that they climb into the shower or jump into the pool with their aids on and fry them. Most people, I think, do remember to take off their eyeglasses before getting their heads wet. The keeper would remind the thoughtful eyeglass remover but relatively new BTE HA wearer to take off the HAs.
The bad news is that until you get used to the loops, if you quickly jerk your eyeglasses off as to clean them or because something is in your eye, you’re going to jerk the HAs out as well and that may not be too cool. You probably only do that once…