I agree that they're ahead of their time, but I totally disagree that it's missing full viewports. In fact, I prefer that it doesn't take up my whole FOV. For

I agree that they're ahead of their time, but I totally disagree that it's missing full viewports. In fact, I prefer that it doesn't take up my whole FOV. For one, it gives others a clear clue that you're somehow using the device, and it can easily be ignored if needed. Not to mention that full viewport wouldn't really be that much of an improvement - AR simply isn't there yet, and for most of the uses (I don't suppose you'd go around reading novels with this), this suffices.