I use it for a VPN. I use it as a gateway between locations. That's what I use it for.
They're Point-to-Point Networks, Metro Ethernet Networks, and over across the internet. We set it up with an AD VPN tunnel in between the various connections.
We use it for interconnectivity between the various sites to provide VPN tunnels. In contrast, service providers, even on Metro Ethernet and Point-to-Point Networks, cannot provide a secure connection between two points.