My one experience with ACA maps was very good, on the Northern Tier Route. Over 4400 miles, I mailed in two suggestions to help with minor route problems, and one of those was at the end of a long day for me and was partly my fault. They supply stamped postcards for that purpose and they apparently get used. Definitely check on-line for addenda.

Getting off route is part of any trip of that nature, I think, and part of the fun sometimes. There's no such thing as perfect.

I found just enough detail to be able to take detours when needed (road or bridge closed, for example). But I would also recommend carrying a state road map for larger detours, or if you need to bail out to a large city. Or an electronic device if you're inclined that way.

Once I met a local cyclist and he wanted to give me a better route than the ACA route. We got my map out, started looking at it, and he said, "Oh good, they have that way on the map now." So there's someone at ACA paying attention to what cyclists say.

Overall they were excellent and well worth the money, if you like to follow someone else's route. Just the hostels and free camping shown were worth paying for the maps.