They have an easy interface that allows me to track my leads, create custom lead scoring rules with various criteria options available and build out different types of landing pages for each type of subscriber I am targeting. Nothing really - it's a good tool and I haven't noticed any issues so far! Lead Nurturing in general is very important in order to gain new subscribers and retain current ones. As long as you follow their instructions about how to set this up, all should be well. We are able to reach qualified prospects through our website, but we know some people just don't want to fill out a form or register - lead nurturing helps us find them!