Tobii Eye Tracking

All the talk of the fun people are having with Vermintide 2 had me interested enough to drop the $30 on the game and try multiplayer games again. Other than Rocket League, nothing really sticks.

Interestingly I found in the settings, setup for Tobii Eye tracking. Looking at the website it seems moderately interesting and the price $150 was not unreasonable.

https://tobiigaming.com/eye-tracker-4c/

So what I wanted to ask the community is if anyone has used this hardware and what they thought.

Thanks,
mmockus