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 service really does matter here!! Having more options than other systems we've used previously makes life easier since everyone gets what each person should know without having too many people trying learn one thing only instead of being trained properly by multiple employees.