I always choose a cashier because they are, without fail, more efficient at getting me checked out than having me fumble with a checkout machine. And that's without having any sort of fresh produce. If I have fresh produce then the machine is even worse. Making me do the job you once paid someone to do? No thank you, grocery/bigbox store. Maybe once in the last 10 years when I had a single item and it was holiday season -- even there express checkout is usually faster.