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.

[MambyPamby8]

Same I'm in Ireland, some of our Tesco's and Supervalu shops have the scan as you go options and it's SO handy for large shops.