Navigon is a one time purchase, maps and app are regularly updated.
Look for it on sale (I paid $79 a few years ago and consider it money well spent )
Don't know about small lane syndrome with Navigon (I live in city), Garmin tends to take you longer distances just to have you drive on the freeway for 1/2 a mile.
That is aggravating !
This is what I seein the US App Store...