The app charged me three times for my order! When it asked for payment, it claimed it didn't go through when it fact it had. My repeated attempts to get it to work resulted in getting charged in excess twice. This is grievously bad behavior, and yet the manager claimed there was nothing she could do about it and the app makes visible no obvious means of remedy. Awful! Update 3/29/2022: The previous event happened several years ago. Last night, I ordered food in the app as a mobile order using a deal, but the receipt showed that the deal hadn't been applied. This was after I had spent like 20 minutes trying to get the app to work--it had frozen on the checkout screen. Even force closing it and restarting it didn't help. In the end I had to uninstall and reinstall it. That was when the deal problem happened. McDonald's app looks slick, and has some useful features, but in the end if I'm going to be unexpectedly overcharged, it's awful. If you have to use the app, I can only say to avoid mobile, especially if you have a wi-fi only device or have poor cell coverage; McDonalds' wi-fi in the drive-through in particular likes to lose connection while waiting. Stores will throw up their hands and claim impotence if you are overcharged for an order using mobile.