I never use them, no matter how long they let the lines get at the regular check out. Aldi's doesn't have auto check outs, and they're faster than even most convenience stores when I used to go in one of those once in awhile, so we know for a fact it isn't the register people who are the problem and overpaid. They also need to put in cash only lines, so all of you morons with the stacks of crappy plastic that works half the time can waste each others' time; I stood in line behind some moron buying a 74 cent candy bar and bag of chips for 6 minutes while he tried to get his stupid cards to work. It should be legal to shoot these assholes.