I like that it is very easy for customers with no computer experience or training at all, as well as those who are not tech savvy themselves have an option where they don't need any special skills/training - just sign up online (which you can do from anywhere).
It's also great if there isn't enough cashiers available during busy times because anyone wearing their uniform still knows how to use this system! You'll always be able find someone willing help out when needed so customer serviceβ¦