The initial implementation is pretty easy to handle.
The anti-spam features are excellent on the email firewalls.
The best part is, I rarely have to access the portal as everything is set up and tweaked the way I wanted it. But the feature set is incredibly granular and allows for deep levels of customization.
The anti-malware, risk scanning has been pretty spot on.
The deployment is very easy. It's quite straightforward.
The most valuable features are security and ease of use.