In the supermarket I visit, they have do-it your-self-scannning for a long time, and I just love it. No more waiting for the queues any more, and you see what you have to pay before you check-out, so can drop some things if you think the bill is too high, so you won't be surprised. The only thing I hate is when they want  to control you, which never happens with two or three groceries, but only when you have an overloaded shoppingcart. grrrrrr.

Oh, and they don't use possettes  or V4, just some text and a friendly voice to explain it.

-How can you improve things when you don't make mistakes?