Ron's got a good point. FWIW, I used CarFax to check out a 1995 900SE cabrio with the V6, and the lengthy report was worthless. Fortunately, you could tell the car was driven by a high school kid, and nobody in the family knew when the last time the time the timing belt was changed. No service records, running hot, low coolant warning on the SID, busted lights, and all scratched up. No thanks.
I think the reports are only worth it for accident reports and emmisions testing, but even if it failed emissions, I don't think it tells you why it failed. But then again, what do I know....