In that case I would be unwilling to use it. A normal checkout provides a point in time and space when what you are buying is reviewed and you become aware of the total and any errors. If someone says there will be no errors, I just roll my eyes.
A store that is arranging things so that there are no checks is a store that is going to profit from its own mistakes. Impersonal forces will drive it to do so regardless of particular human intentions.
This is the sort of relationship I do not want to get into for ordinary purchases. It demands too much trust, which is hard to build and unnecessary for most things.