Kind of disappointing for me for 1 reason. When I heard of Google Glass, I thought it might be great for the niche application of having it start recording when you're looking at your kids or pets in case they might do something cute. Because by the time they're already doing it, by the time you've brought out your phone (or other camera) to record it, it's already done.
High-ish res camera glasses that you could start recording with via voice command or a quick button touch would have been a godsend for me to record my dog or various neighborhood dogs and cats doing cute things before they were totally finished with or almost finished with them.