Louis is concerned with privacy and Google Glass. He's seen interviews with journalists like Robert Scoble who have admitted to wearing them while going into public bathrooms. Leo says that one of the features of taking images is a very loud audible click and having to verbally say "take image." It's designed so the subject knows that they're being imaged. What about video? Leo says that there should be a red light. Leo says, however, that he does like being able to do a search on the fly with Google Glass to get information via facial recognition when he would meet someone he can't remember.
Privacy concerns aside, the larger worry is not paying attention while users are engaged in what's on the screen.