Back when I was doing a weekly shopping trip on my bike with panniers, I tried self-checkout once when the cashiers were busy. Never again. The tall bags just screwed with the sensors too much. Now I'm maybe a bit more inclined to use it because I moved to a house just a quick walk to the store. It can make sense to just dump all of the items on the weighing platform and put them in my backpack and reusable bags later.