For me, I would avoid anyone wearing one and I certainly wouldn't stand and talk with them while they were wearing it.
The truth is, I see the people using this in two categories:
1. People who like gimmicks and would use it a lot initially and then it would end up in a box for eternity.
2. True voyeurs. The very people who shouldn't have access.
I looked at the Google video and thought, yeah that would hold my attention for 5 minutes.
Other than voyeurism, what is it really good for? Are you going to wear a chunk of plastic on your head all day in case you might want to know a direction once a week or to avoid taking you're smartphone out to read the weather (the weather you only look at if you get a phone call)?
I won't be wasting my money on one because it's obvious, for the day to day limited use I would get out of it a smartphone is vastly more practical.
I already know I wouldn't want to look like a looney voyeur wearing it in the street constantly so I would have to carry this chunky piece of awkwardly shaped plastic so I could put it on only if I need it. And if it's for a video, clearly I could take that video with my smartphone much faster than putting on that gadget and powering it up.
Obviously the Google video has to make it look fantastic but analyse that video, how often are you really going to be doing things so fantastic you're friends are going to be eager to watch live and that you are unable to use a normal camera? That would be about 10 minutes a year it you're really, really lucky. (And we can see from FaceBook shares how much people really are into watching their friends every move.)
Directions? How crumby are those directions going to be? On your smart phone you expand them contract them, rotate them. What are you going to do, in reality, on this kiddy toy as well as, let alone better, than your smartphone?
Oh but wow, you can see directions whilst looking straight ahead, well, no you can't, not at least if you want to follow them and not fall over, because you're concentrating on the directions not what you're about to walk into 2 feet away.
So, to summarise: You buy it, excitedly try everything out then after about a day, you're thinking... mmmm, what next? And, if you're not a voyeur, you spend the next few weeks wondering how much you need to use it (before you put it away for eternity) to make it appear you didn't waste your money. On the other hand, if you are a voyeur, you excitedly buy it and after getting caught the first time (the first time you try yo use it) you realise that you're wearing your spycam on your head and everyone can see it so it's rather ineffective.
To be honest it appears to be an innovative but useless gimmick gadget.
Interesting to see if the police come up with a reason to ban it while they are fining you.