Just for the scan and go. You can walk in a Sam's Club and use your phone scanning all your items then check yourself out and be in and out. Maybe a slight line at the door for the person that checks your items. Costco has lines half way to the back of the store and the parking / lot is a nightmare to navigate. The reality is they mostly sell 85% of the same stuff. Costco desperately needs to get wit the times and introduce scan and go to their app. I get that they're Nazis over membership fees and a scan and go app would let people circumvent it but their primitive checkout system makes the shopping experience worse.