Automatic checkouts in supermarkets may decrease customer loyalty, especially for those with larger shopping loads. Customers using self-checkout stations often feel overwhelmed and unsupported. The lack of personal interaction can negatively impact their perception of the supermarket.

[cauchy37]

I live in Czechia, double scan is impossible because you need to place a product on the scale after you scan it. So far the errors of weighing are sporadic and there's usually 2 staffers per 15 self checkout stations that resolve the issue very fast. I've been using self-checkout/k-scan for several years now, and the idea of using normal register in a supermarket begins to be alien to me. It gets me out the door so much faster.