It is normally used to control a pointer not a view I.E doing target selection. So I am wondering what you think it would be used in AH?
If you think it would be used for view control, that would not work, simply by looking at a different point on your screen the view would shift. And then you would not be looking at what you were trying to look at.
HiTech
I have considered this and it's a valid point yet the setup and calibration of the device has a demo of the EyeX functionality which proves instantly how intuitive the device is. And I agree with Drane that one of the great advantages is that you no longer need a TrackClip attached to your headset. The EyeX is pretty new and there seems to be some development potential in it. It works well for view control in ArmA3, the point you bring up is valid yet as the view adjusts the eyes do too, so it's a non-issue. The software recognizes which part of the screen you're looking at, not just the direction, so it knows what you want to look at and adjusts the view accordingly. Yes looking at the edge of the screen naturally will rotate the view, in whatever direction it is you're looking, but as soon as your eyes lock on to something the device is VERY solid in keeping centered exactly what you are looking at, something that can be tricky at times with the TrackIR. This seems to be the biggest advantage of the EyeX, and it's very intuitive to use.
The TrackIR I believe will remain the best overall solution because it does tilt as well as lateral and longitudinal axis positioning, but it's not without its quirks. The EyeX would probably come to its right in vehicles and gunner positions, where lateral movement and tilt is not really needed.
I've had some problems running the device so far, related to the USB3.0 requirement and issues my motherboard has with its USB3.0 drivers. I even had a bluescreen crash once (never happened to me before on Win7). It's a ASUS P9X79 mb, if anyone has a solution to its USB3.0 problem I'd be most thankful. ASUS support has not been helpful, they want the serial number of the MB to even be able to send a question to them, and my box is packed away in storage in a stack of moving boxes. Not exactly jumping on the idea to have to buy a new MB just to run the EyeX properly.
My recommendation is to try the EyeX, but before you buy one make sure that your motherboard runs USB3.0 without any issues whatsoever or else you might be looking at a much bigger cost than you have intended.