while I still like having a paper map if possible as a backup if necessary, realistically using a gps or google maps on my phone for check ups is pretty much the norm nowadays.
As a bunch of old farts here, I think even the majority of us have come to the realization that the tools we have available now are super useful and just plain work.
I figure its an added bonus having the background of using only maps can help sometimes having a bigger picture thing going on in our heads, or to use if there is a technical issue, but really, modern navigation is fantastic and makes all the off road, back country trips we do so much more doable and simple.
If all of a sudden all the satellites go kaput, we are all fracked, but hey, that's unlikely, and we'll figure things out.
The Dura usually sells $250 in the states which is about $350 Canadian. I got mine on sale at Competitive Cycles for 25% off at $200, so it seemed a good deal. I would say its reasonably refined, they have some things to fix and features to add, such as Di2 battery levels. It pretty much does everything a Garmin 850 can do for tracking and navigation at well under half the price. maps are not as useful compared to a Garmin as they don't include street names, yet. TBT does however. I don't use intervals and workouts so cant comment on those features. I am still not sure it's getting the full 120 hours, am doing a 2nd run test of monitoring hours used vs. battery levels, I think it's less than what they claim, time will tell.
For use of ANY GPS in an unfamiliar area, the maps are useful, though a paper map is easier and shows more info, except your current position and only a GPS can tell you that, thus the usefulness.