I just started using Tobii eye tracker in THCOTW. I have both head tracking and eye tracking on, both at default speed. My FoV is set to 63, which is about right, and I have max yaw for the Tobii set at 70 degrees.
It takes a bit of getting acclimated to it, but once you're used to it, it's a very nice addition to the game. I wish the game had a VR option, but the Tobii is sort of the next best thing.