It looks like not many people have experienced the ethereal reaches of grocery store technology embodied by some Super Stop & Shops in New England. You scan your groceries with a handheld unit as you put them in the bags in your cart. All you do at (self) check out is pay.

Vast amount of time saved by not unloading the cart and reloading your bags.

I don't understand how theft isn't a problem since it is easy to even inadvertently forget to scan something as you put it in the cart, but it is a huge improvement in the shopping experience.