Is a 2015 Model S 70D with 27K miles for $55K sold by private owner a good deal? White ext, tan leather interior, retractable sunroof, premium lighting and tech package that has autopilot features (I don't believe it's the "full" autopilot feature - not sure). He was in a minor fender bender but it's not listed on carfax. Also the seller financed the car through Tesla, I believe. He suggested, I pay him, take possession, he pays off loan and then he transfers title to me. We would put it in a sales contract. Is that the norm? WWYD?