In theory I could see really enjoying them in an action sports (backcountry skiing, mountain biking, rock climbing) setting. I'd want 1) true AR that could annotate terrain with stuff like slope angle, aspect etc, 2) all the GPS and monitoring functionality of a Garmin watch, and 3) a high quality action camera that could replace a gopro with less faff.

From what I can tell we aren't particularly close to putting this all together in a consumer usable package.