Integration with other vacation software, and ability to control the narrative in a custom manner. Love the automation behind the scenes. Customer support is amazing. Every time I have questions, they assist me until I have no more questions. I can't wait to see what else they offer down the road. (App, mobile website, etc)
A small learning curve. Requires some hand holding. Wish they had more documentation and mobile version, but I am sure this will only improve with time!