Saw a guy return a slice of pizza from their food court; he took it while planting his thumb on it to give it to his little girl, who then said she didn't want it. So rather than eat it himself, he gave it back to the lady at the counter for a refund. I was wondering what she'd do with it, and both relieved and dismayed when she summarily tossed it in the garbage for the refund. A waste of food, but it would have been worse if it were put back in the hopper for the next person.
They definitely have a well deserved reputation for customer service; pretty surprising the kind of things they've taken back, but ultimately good practice.
Their Kirkland Signature stuff is pretty good, and I got a jar of chocolate covered raisins one time that seemed to have an abundance of stems in them somehow. It was still okay, but not quite as good as usual. Ate a quarter of the stuff, and idly noticed on the label their guarantee of satisfaction. I thought, well, I'm kinda satisfied, but not as much as usual, so I decided I'd give them a call and let them know of the little slip in quality.
Next thing I knew, they had me go back to the store for an exchange, calling ahead to the store to let them know, practically rolling out the red carpet. For a bunch of raisins... A bit embarrassing actually, all the fuss.
But they said they take the reputation of the Kirkland Signature brand very seriously, so they really do make sure of customer satisfaction.