I have setup Primo and did a road test yesterday. I did not spare Primo at all. Well, it did not disappoint me but at 2 points: (1) no speedcam warnings, (2) a freeze when I stopped the car engine.
Maybe some strange choices of routes, but given the destination and me not following the desired (by primo) route, continuous recalculation and strange routing maybe not so strange.
I did not pass tunnels. I say ...