Here's a review that I ran across that pretty much summarizes it:
If you could buy a pair of augmented reality glasses that made the world around you appear to get bigger or smaller, change colors, have glowing psychedelic trails, or make individual objects transparent ... well, that would be an AR product straight out of a sci-fi novel, far beyond anything we've ever seen. Now imagine that same product, only instead of sight it relied on your sense of hearing.
I can imagine that product and I can't imagine any desire to have it.
Another analogy from another hobby of mine, photography: The predominant purpose of a fisheye lens is to demonstrate the effect of a fisheye lens. Once you've played around with it to see what it does, if goes on the shelf.