Did anyone have experience with Tobii Eye Tracker 5 and Elite?
I used the EyeX and 4C, not the 5. It's a very cool technology, and after a while it starts feeling fairly natural. But each time I've gone from eye-tracking to head-tracking it's like night-and-day.
The head-tracking (with TrackIR in my case) is much more responsive. My guess is that the raw inputs from the sensors needs to be smoothed out to handle the involuntary eye-movements; resulting in lag being introduced in the response to your eye movements.
There's also a slight issue with reading text (which there is a lot of in the ED cockpit). The problem is - as you scan text from left to right, the eye-tracking starts panning to the right, so you have to readjust what you're looking at, causing the camera to wobble slightly. Makes reading text really tiresome.
And there isn't (or at least wasn't) any way to set up deadzone profiles as you can do with TrackIR. I have an ED profile that has deadzones added around the side-screens which makes the camera more stable when looking at them and thus easier to focus on and read. It's not the end of the world, but it's helps the usability.
On the plus side, eye-tracking feels like magic; and there's no cable.