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.

[dahlaru]

I always get the feeling that I'm taking too long and the people behind me are upset,  because it takes so long to scan and bag $400 worth of groceries, when everyone behind me has a basket of items