Personally, I wouldn't ever buy a car from a rental car company. The reason is that rental cars are the most abused cars out there. When people rent cars, they tend to believe, that since its not their car, they can drive as roughly as they want without worrying about it deteriorating faster. I know a lot of people who drive rental cars in a way they would never drive their own cars, so I'm assuming these cars may have problems show up before another car that's not a rental car.