i think the correct way to use these machines is 1 item under the scanner then 2 items over the top straight into the bags and so on untl your all packed up
i have yet to recieve confirmation on this from asda
seriously now.
i use the same thing at tescos in haslingden and its ok if you got a small shop but i prefer to use the propper checkouts if i have a lot of stuff becuse they are faster at it