Earlier quoted context omitted.
It works pretty well in the UK. The nice thing is, I can pack my bags as I shop, so I don't feel stressed when I get to the checkout. I use this method of shopping whenever available.
In sweden you have to unpack and re-pack at the checkout. And if you have a backpack you can't place stuff inside it. No. You have to unpack, place everything on a scale and then place everything in your backpack again. And for items like bread or so you need to navigate a number of menus to find it. And of course you are asked if you are a member, if you'd like to become a member, if you want to do a donation, and a…
Yes you do need to be a member to use the system, but that's a very small price to pay for the convenience and speed of avoiding all lines and stress of the regular checkout.