Purchased a set of 3 Carfax reports last year. Turned out the car I bought was the first Carfax I used. The others expired a couple months ago. Offered them to family and friends and no interest.
What I found out about my car was that it was serviced by the dealership every year of its life from new. It had everything done in shorter intervals than the OEM recommended, such as 2500 mile oil changes. So all that was good to know on such a low mileage 2001. That was really the info I needed to know in order to buy it. On the flip side, Carfaxes only list what is reported to them. I was considering a car back in 2011 that came with a pretty detailed Carfax of warranty items replaced. But when I tapped my local GM dealership for their service history, it had another pile of "warranty" work not listed on the Carfax. And because of that I passed on it. Can you imagine a driver getting 2 sets of brakes, 2 exhaust systems, suspension parts, a shifter, side mirrors, window motors, and other items all within the first 18,000 miles/3 yrs of ownership?