[gress]

That's no advantage at all. A real AR HUD wouldn't need to 'take up your full viewing space' but could place information where it was relevant.

[shliachtx]

What I meant by that was that it doesn't put itself into your line of sight, but when you do want it, it is (very) easily accessible.

[gress]

That's true, but it's not an advantage that it's not a true HUD, since a true HUD could place the information out of your line of sight or within it as appropriate, whereas Glass cannot.