In theory, it's saving a little time per customer because that CM isn't ringing up each item at a register and then waiting for the customer to get their card or cash out, and then waiting for the card reader to approve the charge if using a card, and then bagging the items. It's probably not too much time per customer but it could potentially add up over the course of a day. In my case, I'm pretty sure I negated any time savings by struggling to get the hanger off the t-shirt my wife bought (because for some reason women's shirts need plastic straps on the inside?). I did enjoy not having to stand in line with 20 other groups who gave up on respecting personal space about a year ago, though.