I've caught one person in the eye and nearly got it myself with a jo. The jo was getting carried away on my part. The person I caught came in hard, I extended an open hand and they kept coming. We spent a few hours at the hospital after that. Fortunately all ended well.
I'm kind of surprised more people don't get it as I run into a surprising lack of atemi awareness at times. Guess they're unaware because they don't see much of them, so they don't practice atemi and also don't get hit. I guess this also means that the tree never fell in the forest.