The most useful function I have found has been the ability to create alerts which are sent via email when certain conditions occur (such as low disk space). This helps keep me aware if there's an issue in my server without having to check it myself every few minutes! There isn't anything really about this application which makes us dislike using it - but we're currently looking into other monitoring tools such as Nagios instead because they seem more feature rich than what DXE provides by default. Monitoring our servers with respect to performance issues and ensuring all services stay up and running smoothly.