So if you have six of the same yoghurt, you have to scan them and then place them in your bag one at a time. And if you have a 24 pack of sodas, you need to haul it out of your cart onto the scales as you're checking out. And if anything goes wrong (item didn't weight what the system expected; you moved the item too fast onto the scales etc) then you get a "please wait while someone helps you", which involves an employee having to come and clear the error.