Got to try it now. For turning the viewpoint it's not good for sure (but in that case it's anyway more like 'panning' the view when you look to the side.
I think head tracker has simply easier time with that.
The UI element hiding is cool.
Ie. the elements fade out if you're not looking at them.
The aiming with the gaze is too inaccurate 
I tried it briefly in division, and yea... you can get off body shots easily, but the goal in the games usually is to go for head. (You look at point and then press r-mouse to aim the weapon and it immediately aims it at the point you're looking at instead of where the gun is pointing)
Didn't try Master of Orion yet (there it only uses it with a map zoom and some simple stuff.)
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