The ease of use, it makes setting up an email gateway very simple to implement in your organization's infrastructure with minimal impact or downtime! I have not found anything that was particularly negative about this product- just as expected from Symantec products they are always reliable & easy for end users/organizations alike!! We were looking at other solutions but none had all three aspects (easy setup - no need IT support / expertise) good detection rates + low false positives rate so we went ahead wth clearnet secure messaging solution which has been great since implementation over 2 years ago now!