It is very easy to use, fast in execution of tasks at backend as well front end for users when sending out mails or invitations with attachments; SageMailer has all tools you would like to make an efficient work flow as your workflow may vary per time. The interface needs some updates but considering this product's features, it could have been better if they had updated their version of sage mail server to support newer versions. It has helped us automate our business process in several ways. We've been using Sage Mailer since 5 years now and there was no single instance where we felt that its service level dropped and failed our expectations. Great tool and must try once! Automation of data processing across different departments helps the organization save time. It has helped me to get my emails sent out in minutes rather than hours or days, it's very user friendly with good customer service available at all times of day/night! I have not had any issues so far but if i do we are always able for you guys help us resolve them quickly!! The biggest benefit is that now when sending mass e-mails there isn't as much stress involved because they go through within seconds instead waiting 3 -4 hrs like before this program was used (we were using Sendgrid).