Processing and materials are out of order. You get the feeling the spectacle consists of eggshells so thin the materials. I do not know why it has to be cheap, but I think wrong.
Then for comfort. To position the glasses properly you have to pull it quite tight. Then one gets almost a numbness on the forehead, from the forehead cushion. Beautiful prints are inevitable then, my could be seen 2 hours after that, although I have tested the glasses in about the same time. I was able to really look happy again on my big TV. Frankly, I do not know who should prefer the glasses instead of a beautiful TV ... The virtual screen size is striking, there is indeed something like a large screen in front of the eyes, but sees the permanent it is not a real canvas.
That is why, although it should still be no perfect 3D. The spectacle has so many other drawbacks as far as the comfort that this also can not be the alternative. Since much remains to be done.