As a sysadmin I use tor regularly as a easy and free third-party perspective. If there is a problem but it works when I test it, I then go and test in tor in order to eliminate any potential effect in my local network.

Tor is also ipv4 so it is a convenient way to get a ipv4 web view inside a ipv6 enabled network, without having to deal with browser plugins or adjust the interface on the machine.