Don't trust it in Spain! We used it to get to Sagrada Familia in Barcelona. Directions had us get off the bus and walk half a mile. After walking for ten minutes we checked again and we were now .7 miles from our destination. Switched to Google Maps and the bus dropped us off across the street. There were several bus stops around the church and two metro stops on the same block.
Worse yet, we were coming back from Getaria, about an hour by bus outside of San Sebastian. Apple had us get off the bus that locals had told us would take us straight back to San Sebastian. We got off, trusting Apple Maps after three stops rather than the locals. We walked a quarter mile to another bus stop to find that the next bus from that stop to San Sebastian would arrive in an hour. While at that stop, my wallet was stolen.
I've taken Apple Maps off my home screen, and will rely on Google Maps and Waze from now on.