OnX is worth the money, regardless of whether you are just buying one state or all 50. It has been worth its weight in gold on out of state trips, as well as hunting around home. It has helped me plan routes, find new properties, and even helped me out once when a landowner was disputing that I had shot a deer on his property. Showed him the map, where I was, the track that I had walked, and now we're on great terms. Like Rob has already listed, there are a ton of useful features.