It's really bad on my iPhone 13. Surprised they released it here. After one or two clicks it needs to recalibrate. There doesn't seem to be a way to not click on things either. No way to change apps. After the third recalibration, I selected "yes" to "would you like to disable eye tracking", and while eye tracking was disabled, I also lost access to swiping down on the control center or swiping up on the app switcher. Had to restart the phone to get things back to a usable place.