Intelligent Investigations was useful for me. I ran a comprehensive background check on someone I had planned to rent to and they provided me with legal background showing a pattern of evictions and controlled substance arrests. They probably saved me a lot of grief. In addition, they sent a free report on any convicted child molesters in my neighborhood as part of the "neighborhood watch" program.
One caveat: when I ordered the comprehensive report I was automatically enrolled in trial membership of two programs, the neighborhood watch (24.95 a month) and another people finder type program (19.95 per month) You have 7 days to use neighborhood watch and only 3 days on the other one before you will be charged the monthly fees. The neighborhood watch includes another comprehensive background search free, which is nice - but you need to pay attention and cancel within the allotted time. I canceled and they immediately sent a confirmation. I was not charged the monthly fees.