As a customer, the only self checkout worth having is the kind you mostly find in clothing stores, where you dump all your purchases in a tub and RFID does it's magic to detect all the items in a second. You pay, you pack, you go. Only once have I encountered it in a grocery store (REWE in Hamburg) and it works even with the fruits and vegetables! The printed label you get from the scale in the fruits and veggies section also has RFID ! Magic. All the rest is absolutely trash, it's annoying and doesn't saves time at all unless you have less than 5 items.