It works. You still have to pay for it, but it's cheaper than Carfax. I did it for my brother when he was getting his 'tour. Don't know how accurate it is though
My Cars
1999 Silver Frost SVT - 80,000km #2603/2760 Aug. 10, 1999.
1996 Mercury Mystique LS V6 MTX - retired @ 323,151km.
1995 Ford Contour V6 MTX-sold @ 214,000km