The app is slow and unwieldy. Placing a simple order for 2 sandwiches with minimal customizations can take 15 minutes simply due to how slow the app is. It frequently will not accept any form of payment, making it absolutely useless. You spend 15 minutes creating and order, get all the way to where you press the button to pay and it says "error". No explanation, no error code. Just "error". Change payment types, change locations, reboot phone, nothing helps.