I've got a Lumia 1520 and was using Nokia Drive + over the weekend and wasn't too impressed with the results. I was traveling from south Waikato to the Coromandel and it seemed to be pretty set on going via Paeroa. Total drive time it said was 3:48 mins but I ignored it and went our normal way which it accepted and reduced the time by over 20mins and near the same number of kms. Changing the settings didn't seem to make any difference to the route it wanted to take.
Then on the way back we were going to Hamilton and it was insistent on going up to Bombay before coming back down SH1. Seems a really long way to get there.
I'm used to TomTom on iPhone which gives pretty good routes so this was a bit of a shock. Are any of the other apps available any better. A bit hesitant to pay $60 or so for the same sort of result.