What sort? You tagged restaurants, but I don’t think I’ve ever run into a restaurant self-serve kiosk.
I have used self-check-outs at grocery stores, but I recently had an annoying experience with one, and so I’ve stopped using them unless I have something really simple. They’ve been good when the human lines are really long and they work. But sometimes they can be quite annoying.
The annoying recent experience had me scanning maybe twenty items before the human attendant came over and told me it had actually been ignoring me because I scanned something with alcohol and it stopped paying attention to what I was scanning, even though it was still beeping and seeming like it was scanning stuff. I had to re-do the whole thing, and when I rolled my eyes at having to do that, the attendant acted like this made sense because “think if a child bought some alcohol!” as if that was a reason to have it ignore my scans of other groceries.