I'll avoid - never come across it so far, but I did find one that purported to track your ancestors military records. Not only did it not find details I knew already to be correct, they had the cheek to automatically renew the one month membership I took to try it out. Yes, it was all there, buried in the small print but I hadn't seen it. I decided to take the hit and write to them asking them to cancel. Imagine my annoyance when they took another month. It seemed I had to go to the site and cancel, not write to them - I'm a lot more careful these days!