What was often criticized here that the scope of the app is small and the version of the app differently I can not confirm. With me Navigon 5.2.0 is installed and thus the same version as in the Google Play Store. One difference is of course the maps but that already says the name.
What, however, is somewhat upgradeable, are the cards. On the one hand the cards are (although the latest) date. Some of these are also inaccurate. A few times made me navigate the navigation-facing unerringly or on tracks of Deutsche Bahn. This can open source navigation solutions on Open Street Map-card base better. Perhaps it would be an idea for the future Garmin to focus on this, or at least give the possibility to use it as a card base. ;-)
But all in all it is a reliable app that runs smoothly and works well with Bluetooth. Who wants to have a good app for fair money should look at the app and access when it is back in action.