I checked it out, but I didn't find it very useful. You have to put in all your own information, so unless you already know your whole family tree, it doesn't tell you anything. And if you already have that information, what good is it? (Unless I was doing something wrong.)
You don't need to know you're whole family. You just start with what you DO know. They have "hints" that connect you to information that may be valuable and takes you further back in your ancestry. You also take a person and SEARCH for info on that person and up pops a list of census, military info, newspaper info, naturalization, birth, baptism, death and burial info, even public records like where your ancestor lived and other members who are doing the same family. Some even have public school photos and photos of their ancestors that they freely allow others to use.
I used to go to different states and counties to find info on my family until I joined Ancestry. Now I go there first and then to other places if I can't find anything new.