Easy integration between your website or store front end as well as emails are very simple process which saves time of many people who have been working in this area. I used it few times but they didn't resolve any issues so i stopped using them again because there was no improvement at that point of time. So if you want more features then don’t use expert sender otherwise its good service provider. It will save time by automating sending mails from my website/store fronts etc. The best feature of this software is its easy integration with other platforms like MailChimp and Aweber as well. I have used it in my previous companies too but always felt that if we use some extra features then they should be added into free version otherwise there was no point using paid product. Easy to customize the templates/emails etc and send bulk emails.