Anyone use Padhawk? How does it find the info?

[Lee Haenschen]

I like the features of padhawk, but at the moment being new to REI I can't quite afford the $99 per month. The only part that I want to use of padhawk that I think would help in my negotiating is the feature where you can find out how much the person owes on their mortgage (if any). Is there somewhere on my cities website that I can find this info as well? What is padhawk tapping into to find that kind of info? I think this would really help when negotiating on a house, I would be able to tell right off the bat if I am wasting my time if my offer would be lets say 20K less then what the homeowner owes on their house.