Costco stands by their products. They keep digital receipts of your purchases so if you do have an issue with a product purchased at Costco, you can go and get it replaced. I'm sure some people have abused the system, but their policy (as far as I know) is to always replace the product, no questions asked (or refund if you don't want a replacement). Never had to use it myself, but it's one of the reasons I shop there.