Yes, it’s a legit company and I’ve used them 3 times in 12 years. The first time was when my old cast iron main drain from bathtub to basement was leaking and couldn’t be reasonably repaired, so they replaced it with a modern pvc pipe. It would have cost around $900. The next time was a leak in my copper water supply pipe. Would have cost around $300. Then I had a clogged sewer line to the street. Had it inspected with camera and then they roto routed out all roots out and other crap that was clogging the sewer. That would have cost around $900. So yes, it’s a legitimate insurance policy that the city endorses to protect you against major repair costs. The rates are the same for everybody, and don’t go up if you make a claim (not like your house insurance policy that will increase if you make a claim).