I like how easy it was for me to set up my account (it took less than 10 minutes) as well as their customer service team being very helpful! We were able to get our campaign live within two days of purchase date. The emails we sent out weren't getting opened or clicked so after trying several things with no success, they helped us figure out what happened from there which allowed them to help fix this issue immediately without wasting time/money before then. Nothing actually - but if you have any questions please contact one of their representatives who will be more than happy to assist you. They are willing to work directly with your organization's IT department when needed. Helping send newsletters via email campaigns to reach new customers/prospects.