I think Bluetooth is a fair comparison with the aesthetic quality of glass. The recording capability is what pushes glass into new territory though, in my opinion.

I can imagine people actually flocking to a glass wearer for attention, hoping they are being recorded and posted online just as they might flock to someone with a cellphone camera. At parties, hanging out with friends, at a club, etc. I can imagine it being a lot of fun. If I were discussing business or a stranger approached me wearing google glass, though, I would probably be hyper-aware that I was possibly being recorded.

I can also imagine plenty of scenarios where google glass would make people extremely uncomfortable to the point where you would be asked to leave (nicely or not). Which is not something that would probably ever happen with a bluetooth receiver.

I said "Bluetooth, that will never catch on, who wants to go around with a thing in your ear with a flashing blue light? Makes you look like Borg." Now people wear them all day.

And I never thought I would see people walking down the street staring at a phone. "That would be dorky." Now people nearly collide with me on sidewalks because they're looking down and, what's more, they eat meals in public places with the phone sitting on the table like it's a little person.

They most definitely do not wear Bluetooth earpieces all day. There was a brief period years ago when it was (relatively) a lot more common, but the richly-deserved backlash appears to have mostly eliminated the practice. I can't even think of the last time I encountered someone who just kept it on all the time. Purely anecdotal, but I think I've actually seen people using phone holsters more recently than I've seen anyone walk around with a Bluetooth earpiece when they weren't actively talking on the phone or driving.

Maybe it's regional, I dunno. I'm in the Bay Area FWIW.