I bought a pair, hoping to explore using it to keep notes for my slides and help track time when I'm doing a presentation and the like.
I bought it right after Facebook did the Oculus Rift acquisition, when I canceled my dev-kit order, and I wanted a thing I could fiddle around for development purposes.
So far in exchange for my trouble, I mostly get to stop and answer questions about Google Glass several times a day when I wear them. That much isn't so bad.
Now I have a device I wear that has to maintain a constant link to my phone, draining its battery, so now I have to recharge two devices faster and I can't use it as 'more convenient' navigation without getting out my phone anyway to go to the app to turn on GPS, so its day-to-day usage is just flat-out painful.
Oh, and I have to carry an extra pair of glasses, despite having switched the Glass to prescription lenses.
Why? If I walk to work, which takes about an hour and a half, if I use the glass at all during the trip, it is typically out of juice by the end of the walk, so now I have to plug my glasses in at the office, which means I need to get out another pair so I can still see.
And I better remember to carry the case, because if I go to the movie, the MPAA will get me arrested if I forget and wear them in, but since they don't fold up, I have to choose between a huge hard case or a big bulky pouch I'm constantly worried will go crunch.
Oh, and I'd better switch to my real glasses when I drive, lest I get arrested for that, too.
Oh, and if I walk by a school I get paranoid parents who think I'm out to take candid shots of their precious children, despite having a third party lens cap on.
I've had some punk kid try to rip them off my face and run on the T, so there is an apparently increased theft risk.
Now, because they polarize the glass in the prism they use to reflect light to your eye you can't get the lenses polarized or treated with any sort of anti-glare, but if you walk around in sunlight light reflects off the bottom of the prism into your eye constantly.
There is a little bit of silver mirroring that is just deposited on the end of the prism -- not covered with anything. I went for a walk in Australia on a humid, high UV day. It just flaked off, which effectively dropped my screen to about 10% brightness. They did replace it, but it meant a few weeks without a device, during which I decided I didn't really miss the inconvenience.
So in exchange for $1700 or so (after adding prescription lenses) I get to get called a glasshole by the internet and get treated as a even evil child-stalker road-hazard pirate pariah by society, and have to carry another pair of glasses anyways.