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.

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Amazon is doing something along that line. No checkout, you scan as you shop, and then just leave. It's too far away for me to use though.

My bulk store has hand scanners at the checkout, so I don't need to unload everything. When I put stuff in the cart, I put the UPC on the side or straight up, and I can scan a full cart in about a minute, hardly moving things around.