Easy interface, easy reporting options (including historical data), great customer support - I can't think of anything at this time! The only thing lacking in bilload right now would be mobile apps but we are working with them about it so hopefully soon they will release those as well. We have been able use our website from anywhere without needing an internet connection or paying additional fees which has really helped us out when traveling around Europe while doing business there since all you need access too do your work remotely via wifi/3G etc..