I like how easy it is to use, it's not too complicated but also doesn't feel overwhelming. It's great for tracking things like open rates. The UI could be improved a bit in terms of customization, but that's just my personal preference. You can have multiple accounts and different email lists within one account. We've been able to see what content does best with our audience and adjust accordingly. Their ability to customize the tool really helped us to get through the process of solving our needs. Their support team is very responsive and is willing to help all the time! We had some issues that were not solved within a reasonable time. We should have been able to resolve them faster. We had to deal with many problems with the tool and their support team helped us to resolve them all. We had to change our website and their team helped us to do so without any issues.