Just annoying
It is not simple or quick to open the app to scan the QR cose for your purchases. When you are juggling bags and receipts and shopping carts it is really annoying. The updates are forced in you when you open the app even when (according to the description for the latest update) the update is minor. Seriously? You expect me to wait at a cash register for the app to update before I can pay and leave. Not a user-friendly experience