I got a free one for my 14 year old car after my local news station alerted me to a limited time offer. Glad I didn't actually pay for it because it is totally not worth it. The report did not detail any specific information about my car I did not already know other than an emissions inspection date from 12 years ago

Information such as date of previous owner's registration, the rest of the inspection dates,etc were not in the report.
I don't know what other carfax reports look like but judging by mine it doesn't seem it will be helpful to anyone buying a used car other than confirming obvious damage they would easily detect by looking the car over. Just my humble opinion.