The best thing about this product is that it allows you to create multiple different lists with many different variables. It also has a robust feature set for creating and maintaining those lists. Nothing really, but I think they could add more features such as being able to customize fields for each list. They are working on that now. Also, I don't like how the UI looks at all. It's very outdated and not user friendly. We created several different lists for our company to segment customers into groups based on their interest in our products. This allowed us to target them differently and better.