The ease of use, the ability to do mass email campaigns with no coding needed. I like that it allows you to send emails to multiple recipients at once from one place. It's easy enough for beginners but has all the features that advanced users need as well. There is nothing I dislike about this software, it's very easy to use and get started! If you're looking for a tool that will allow you to do mass email campaigns without having to write code then optizmo is what you're looking for! We are able to easily automate our email marketing campaigns.