The thing I don't understand about these devices is that they seem to always be built on the assumption that everyone on planet Earth is some kind of tech-obsessed douchebag (with no disrespect to the former intended). I mean seriously, you're gonna "check in" to a friggin' coffee van? But that's probably just because they wanted to show off all it can do.
On top of that I could just see a rise in accidents and vision impairment with your sight constantly being barred by flashy updates, not to mention people looking at you funny 'cause you're essentially talking to yourself all the time.
At least with something like a smart phone not only do they not expect you to strap it to your face 24/7, but it's such a diverse device that it can cater to people like me with just calls and the occasional photo to people who love themselves a bit of gadgetry with apps and functions out the wazoo.
Then again, I'm the sort of guy who's heart breaks whenever he sees a group of friends individually glued to their phones instead of interacting with each other, so maybe I'm just seeing this negatively as that friend situation times a billion and without the normality of carrying it around in your pocket until you actually need it. Plus:
One of those rare times when something could actually be improved by more closely resembling Kanye West glasses.