Also using properly applied RainX with my '17 Ltd w/ Eyesight with no lane change or other issues noticed than without RainX. Son w/ '16 Legacy w/ Eyesight also uses RainX w/ no reported problems.Meh, I use Rain-X all the time and haven't seen any adverse effects. I also make sure to correctly apply it and not have any streaking at all. The key is, apply Rain-X, wait 5 minutes for it to fog up, buff off with a lightly damp cloth checking the glass against a bright light for streaking.
Rain-X actually improves EyeSight performance in heavy rain by giving the cameras a lot more unobstructed view of the road ahead than untreated glass.
Obviously this is only for the outer surface of the windshield.