I've been really tempted to get a pair myself, but I don't think I have a many occasions to wear them. I can't wear them to work due to professional dress code and I'm always barefoot when I'm at home. Considering those are my two main states (I do the majority of my coursework from either home or the office), I would only have the rare occasion of when I go out to where them. Even then, if I go out to dinner with my girlfriend, or to a nice place with friends, I can't wear them.
Nevertheless, I do want a pair. I think if they stick around for a while I'll eventually end up getting some.