The ease of use, it allows you to quickly build out all of my campaigns and automate them with little effort. There is so much customization available that it's very easy to tailor each one to fit your needs and goals. It can sometimes be buggy, but that depends on how busy it is at the time. If I'm working on something during their down times, I don't have any issues. They do a great job supporting their product and responding to requests/questions. Our main benefit has been our ability to automate repetitive tasks and keep our team focused on what they should be doing - not creating new content.