I rode the Southern Tier eleven years ago using the ACA's printed maps (which are great), but when I'm exploring new territory these days, I use electronic maps. I'd never discourage using printed maps, especially as a backup, but I think the choice between electronic and printed maps these days comes down to a philosophical or aesthetic decision. With printed maps, I spent a lot more time fussing with my maps, trying to figure out where I was, and missing turns than I do with electronic ones, but—if the choice is between a big foldout map and a 4" screen—it's much easier to understand the route overall with paper maps, especially if they include elevation profiles.