Setup & configuration were a breeze!
OpenDNS | Providing A Safer And Faster Internet
And it's FREE!!
Setup :
https://www.opendns.com/start/
Keep those kids (or workers, or guests, or etc) away from things they should be seeing, or exposing your system(s) to. And remember that NOTHING works 100%, but their Reputation looks like they keep on top of things quite well.
Free Web Filter - Parental Controls for Your Internet(s) 
