I am a genealogist who has been doing research for over 25 years. I have used this site and others for my research. I prefer this site over others out there, because you know for certain that a headstone is where records state that it should be. This is due to the GPS technology that drives this site. You don't get that kind of guarantee on other sites, who I have found are often mistaken.
I have traveled around the United States using their app to document family graves. Our family just recently traveled from Utah to Georgia, Alabama, and Tennessee using multiple devices to capture images and it all went off without any problems and worked beautifully. I would recommend this site to anyone and everyone to capture family headstone data.