I don't use them...they aren't any faster than any other line; the local store's self-check has a 20 item limit anyway. And I bring bags with me and bag my own groceries. If I have any rage-building peeves, it's the old fogies who still think it's 1957 and wait for the checker to bag their things as they stand there doing nothing, then wait until the total comes up before searching for their checkbook.....or, for laughs, attempt to use the card-swipe. Point is, clueless knows no bounds, nor does technologically disadvantaged.
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Don't blame me. I didn't vote for either of'em.
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