Three years ago, I used ForeFlight “in anger” for the first time on a trip to Oshkosh and back. 1000 miles each way.
The nav capabilities and the airport charts and information are marvelous but for me, the outstanding feature is the ability to display fuel prices on the map.
Those numbers dictated our fuel stops, often at little, deserted country airports with a few hangars and a self-service pump. We easily saved the cost of a ForeFlight subscription by avoiding FBOs.