I have a special nostalgial for bikecentennial despite not riding it in 1976. I wanted to and missed the chance, but I read and dreamed about it. So AC caught and maintained my attention until decades later I rode the TA.
I do really like their maps. I am lazy about planning and can just buy the maps and head out on a trip of any length up to coast to coast. I may deviate from their route a good bit as the mood strikes me, but it is nice to know that I have a route that I can just head out on.
Their other stuff (magazine, etc) wouldn't have even put them on my radar.