I consider myself as quite knowledgeable regarding all B-roads in proximity of 100km from my home. Still, Kurviger found for me so many new roads and interesting round-trips that I am amazed. Great work!
The app still has few glitches and UX is not exactly how I’d like to be, but still recommended by me. I use Touring Plus because I love to see how far is next turn and this is only Navigation / Plus.