I used it quite a bit last summer and found it helpful to an extent. boondocking.org can be a helpful supplement. There are certainly farrrrrr more options for free camping than are listed on either. Best bet--esp. if you are in the western half of the country--is just to head towards national forest land and drive up some forest access roads til you find a good dispersed camping spot. Camping is free and legal in federally-owned land unless posted otherwise/subject to restrictions, and this generally ends up meaning national forests. Often you'll find beautiful established sites with firepits set up by the forest service in order to limit the impact on the land to a few spots. Some of the best camping I've done, free or otherwise.