No, I didn't purchase any copies. I just did searches under my current and past names. Under the searched name they would list aliases. All my aliases were listed but there were some bogus names too. They also listed possible relatives and they were all correct too.
Aside from future possible employers doing simple searches I also didn't want my ex's family snooping around trying to cause trouble (sad but true).
For the simple search it didn't list my gender but they do have generic male and female icons with your name(s). Mine was male.

I don't know if the bought info says it or not.
I'm going off the hopes that future possible employers will be too lazy and/or cheap to get paid copies. I think if you seem like a decent, honest, hard working and talented person they probably wouldn't suspect anything. If simple confirmations are legit like past employers & references, Social Security & DMV info, etc. then that's probably good enough. The exception might be government jobs- especially those needing clearance.
From my research it seem those 4 sites were the main sites. Any other companies who offer this service seem to just get their info from these main 4 sites, so they're basically middle men. There might be some smaller companies out there who do their own research, but I doubt many people use them.