The most useful features are the ability to see what I'm missing (such as email opt ins) which helps me understand my marketing strategy better than ever before. Some things could be more user friendly - like how you can export all your contacts into one file for an example - it's confusing because there isn't an "export" feature anywhere. Also some filters may not work correctly if they aren't used often enough. Make sure to test everything out! If you want to know where people are leaving off when completing their purchase funnel then this product will help you figure out exactly where you need to focus your efforts. We've been able to optimize our campaigns by targeting specific groups of customers who have left certain points along the way.