Properly for the use it is intended to fill, to be specific. The example I used to describe why on-device maps are good didn't involve me trying to re-route on the road, or any of that nonsense. It was simply that while we were out in the high desert, we decided to change the route heading back and wanted to know the rough time it would take. Having the maps and POI information on the device helped us because it meant we could plan breaks/etc on an 8-9 hour trip down the highways. It made the trip back more interesting since it was a route neither of us were familiar with, or had even really seen anything of up to that point. So it was a bit more scenic in that sense, even though we were zipping down the freeway through mountain passes.
Had I used MotionX or Telenav (AT&T), I'd have to get back into civilization before we committed to a route change, instead of taking it in a more relaxed manner.
Oh, I don't consider it that, your post is the type I think the OP needs to see about MotionX versus the one I was originally responding to. It didn't have any content to help the OP really make a decision that meets their needs.
So when discussing this stuff, I think it helps that we discuss how we use the app, and why those features made app X or Y the one for us.
For me, some of the advanced features (routing, itinerary, etc), and ability to be spontaneous without limitations is what pushes me away from the apps tied to cell service. They have gotten quite good, they just don't fit my usage patterns right now.