It's really easy for administrators of multiple environments, it helps with troubleshooting (e.g., VM migrations).
Monitoring virtual machines across different locations can be difficult without this tool. There are also some bugs that I've found in our production environment, but nothing major yet. We use VMs heavily at work and we have lots of servers around the world so having something like this makes sense here as well - you don't want to spend time manually checking each location every week/month etc.