At least with self-check out, every single items needs to be scanned, as there is no "times 10" button, and they get picky about sensing weight after each item. This can be quibbled of course (skip bagging, theft, etc).

The weight checking drives me up a wall. I use this primarily at hardware stores and I frequently can't fit large/heavy items on the output scale. Or the opposite problem, I'm buying a shim or a screw and it simply doesn't register.

For sure, after having discussed with someone working there I can tell you results are awful.