The ratio of guests who say "oh cool! This is great!" vs. those who say "so you have 20 checklanes and only 3 of them are in use, but they want you to use this? That's dumb." is very very shifted towards the latter.
Also, it's fun when the guest tries to hold onto the device to put their pin in and accidentally closes out the app. The solution of "I'm sorry your card was charged multiple times but we can't view the transaction to prove it didn't go through" doesn't quite go over well.
Also, it's fun when the guest tries to hold onto the device to put their pin in and accidentally closes out the app. The solution of "I'm sorry your card was charged multiple times but we can't view the transaction to prove it didn't go through" doesn't quite go over well.