OC – I don’t know how they’re model works but you can download historical data for a house then download the same history 6 months to a year later and the entire historical has changed. Either they are constantly shifting their models, which if they are they should be explaining that to remain credible, or the process is being automated and filled based on what could be fraudulent data that is being published. Either way without explaining what is going on there is absolutely no credibility to their service.