One issue with these is that they don't always ask you to rate what you expect. For instance, my local Walmart has one with a small sign above asking you to "ra

One issue with these is that they don't always ask you to rate what you expect. For instance, my local Walmart has one with a small sign above asking you to "rate your experience with self checkout" yet everyone who checks out with a cashier uses the button assuming you are resting any checkout experience.