Most stores in my city (in The Netherlands) just have a little terminal you can carry around the store with you. I scan my items with the terminal, it shows me the total price, discounts, points acquired (if I scan my customer card) and then i have the terminal scan the QR code on the self checkout and I just pay. Everything is already in my bag and they rarely check. It's great!
I installed MX on an old Acer tablet/laptop Hybrid. It's one of the few that would run due to its 32bit bootloader but 64bit system. It works fine, but I wasn't blown away either.