The most useful feature is being able to set up alerts for known phishing emails in our corporate domain. I wish there was an option to receive notifications via text/SMS as well. Sometimes it takes time before the alert goes out or we're notified and sometimes the threat isn't blocked until later. That's fine if you have other tools that work better but keep looking because this one does what it advertises! We've noticed fewer phishing attempts since implementing these filters and are getting warnings about suspicious activity so quickly.