I don't know if I buy the sunglasses analogy. Sunglasses are inappropriate to wear when it's very obvious that they are unneeded due to there being no sunlight.

I don't know if I buy the sunglasses analogy. Sunglasses are inappropriate to wear when it's very obvious that they are unneeded due to there being no sunlight. If you are in sunlight, they are suddenly appropriate. Also, in the right context, sunglasses make you look really good. In what contexts will Glass be appropriate? Will they be contexts that are generally accepted and clear? How often will you be taking them on and putting them off? Will you be keeping them off more than on? Will Glass always make you look doofier than without it, so the pressure is to only put it on when it's "worth it"? At some point if you are not wearing Glass very often due to various other reasons two things are going to happen. First, Glass's overall utility is going to be limited to "on-demand" applications. This is clearly not what Google is going for since the dream of Glass is that you will be able to capture much more spontaneous moments since it's an always-available camera. Second, you are going to have to weigh the utility of (this now limited) device against your other devices and the annoyance of carrying it around on your head all the time. Eventually if the thing is not useful or you feel like a dork wearing it you are going to start leaving it at home.