The gripe about being completely unable to enter a quantity of an item doesn't match my experience. But it isn't obvious how to use it - do you scan something, then enter the quantity, then put in the bagging area? Turns out no, you enter a quantity, scan one item, then put them all in the bagging area. But I discovered that if you enter a large quantity and can't put them all down in a certain time frame, it will complain the weight doesn't match and you have to wait for the supervisor... So I guess it works best with quantities of something you can fit in your hands.