This software works great as it was designed well; everything you need has been thought out very well. When one feature wasn't there that I needed I started looking around for another product but couldn't find anything similar. So far so good though! We are able to send thousands of emails per hour without issues or slowdowns using this system. Email success provides us with an interface that is easy to use and allows us to easily customize the emails being sent from our company. There are some features that are difficult to use or not very intuitive. Some of our employees have trouble setting up email campaigns or using the interface. We've been able to have a more efficient email marketing workflow. We've been able to send emails to specific groups without having to send to everyone.