Buddy of mine got a Glass to brainstorm app development with for work and so we were just trying it out. It clearly is not yet ready for consumer use if for no other reason than it is at least an order of magnitude too slow / lacking in positional fidelity to be the sort of seamless device that everyone would Need/Want.
Taking a picture with it was at best "meh". Yeah it is hands free if you are willing to up-nod your head to turn it on and vocalize for it to take a pic, but otherwise just grab your phone. Motion tracking was fairly terrible and no where near the fidelity of, say, an Occulus Rift...but that makes sense given the form factor of the thing. The directions and HUD/compass are cool, but it was easy to confuse the compass just by moving your head in a normal way. I suspect that if you are actually walking and not just standing still it would compensate for it a bit, but in order for it to be a killer device it needs to be completely aware of its position and orientation at all times.
The true "woah" moment was when using the translate function whereby it superimposed the translation on top of the original language / approximate font in such a way that it looked as if the sign simply changed into the correct language. Still a bit clunky since you have to keep your head still and really focus on the text to be translated, but the future potential for that in a multilingual society is pure gold.
More than anything else I felt like I was using an Apple Newton. A device with the basic functionality of something that would become well nigh indispensable in a few generations, but lacking in the speed and functionality necessary to catch on in a big way.
