In Australia, close to all supermarkets are majority if not entirely self checkout. Even a lot of retail brands like hardware stores and clothing stores are self checkout.
The ones like Uniqlo where you just drop the items in and it instantly scans them all are incredibly nice to use.
- bad touch screens that lag.
- even more lag when you're trying to pay.
- frequent (about 60% of visits) requirement for staff because it disagrees that I've put something in the bagging area, or some other reason
- unnecessary and slow modal dialogs about rewards programmes, receipt etc. I wish there was just a "leave me alone and let me pay by card" button that just lets me tap and pay.
I still use them most of the time because there is almost never a queue, but if the human checkout lines are empty or almost empty I'll use them instead, it's much faster.