I have found that more than once per trip the map and the voice guidance do not agree. The voice may say turn right when the map indicates left. By experience I find that the map is always correct. I had the same problem with TomTom which I used previously. This was a problem when I used voice guidance only to extend battery life.
Since I travel a lot, getting to major airports should be an easy category, but there are only airfields listed. I got over this by finding the street address of the airport in google and then it will get the airport location.
Rail stations, bus stations and airports should all be easy to find.
Sometimes when not in wifi contact, the program will refuse to find a destination, even though the maps are loaded, difficult when you are in a strange city with no maps.
Did anyone else see these problems?