I constantly use tor as a way to get a third view when debugging connection issues for customers and malware infected websites. If you ever experience the issue of a customer saying they can't connect, but when you test it it works perfectly fine, tor is great to verify if the issue might effect more customers. As a side effect of it being ipv4 only, you can also test issues when one protocol work but not the other (there are alternative tools but tor is by far easiest at hand).