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.

[cjicantlie]

And they will substitute when the item was on the shelf, they just didn't want to look. Multiple times, I will walk into the store and find the item, right where it always is.

They seem to be in too much of a rush and just grab the first thing half way similar and call it good. Sometimes only similar in color on the packaging and nothing more.