It's funny how divided a topic this is.
Could just be my area but the machines always fail in some way or another.
Give me 10%off if I am doing the job of an absentee cashier... Always cool seeing many checkouts all decked out in gear with noone there to run them. Ever.
OR, even better, use some decades old tech and spend a penny to put RFID tags on everything so I can just run my cart through and verify the list of stuff and click Yes, No, Maybe.
Somewhat related.. is it just me or are liquor stores the best at this? I never even stop moving and I'm out. Then i go next door to the pet store to grab some animal chow and I stand in line for 10mins because just one register of 6 is staffed.
At least we can order everything online for the most part now.