Not quite usable
The app is not stable. I start listening to the audio for a landmark, then switch to the maps or camera app, and the audio plays for a couple of minutes and then crashes (most likely) as the audio stops, and when I go back to the app it asks me to buy the app again. How could it forget that I purchased the audio? It’s not impossible to resume the audio, but it’s cumbersome when it keeps happening every 5 minutes. I would say it’s not usable on location, when you want to orient yourself or take pictures.