The ease of use, it's easy for my customers with little or no experience in car X technology (or even using computers) to learn how their vehicle works once they are inside our system.
It is also very intuitive! I am not sure what else there really needs be said about this program other than that we have had great success since implementing it into all vehicles at work over two years ago now. There was nothing specific but everything seems seamless from day one through training new users as well as ongoing support when an issue arises.