The best things in PRTG are adding sensors, setting alarms, monitor bandwidth utilization and the most important thing is generating reports. Report is generating correctly (Day/Weekly/Monthly) which I am showing presentation to my Managers which is my favourite and able to win my Managers confidence.

As the title states, it's easy to get up and running quickly. I got a good network picture in about 15 minutes, and then started whittling things down. It's lightweight and responsive. Very minor network impact and isn't taxing to the host system. The info can be displayed in various coarse ways, each one dramatically different from the previous one, or you can make your own more subtle changes. The dark skin of the web interface makes a dramatic impression on visitors. Web interface is fast! Automated ticketing system and alerts works great. Once you get it tuned, there's 0 false alarms, and you'll get notifications if the alarm clears before you can remediate.

Free version allows you 100 sensors, with all features enabled. Server hardware health and alerting via iLO/DRAC VMWare host health checks and alerting VMWare guest health and alerting (including storage latency and CPU) Mobile app provides charts and status from anywhere Down sensors can be "acknowledged" which lets other techs know the issue is being handled. Predictive metrics determine "this sensor is unusually low for this day of the week" feature has actually turned up several backup failures and switching issues I'd missed because they were working nominally. Round trip email (SMTP send through gmail -> deliver to another server -> POP3 receive) is a lifesaver to tell me Exchange is TRULY working. Reports allow for billing of colocated services