It was a beautiful sunny day in San Francisco. I rent the go car for 3 hours. Unfortunately, half hour into the trip the GPS stopped working and we had to navigate our way back using a street map. It was hectic and nerve wracking as the traffic in San Francisco is heavy. The gentleman at the rental was sorry for this problem, offered us a free trip and told me I had to go through viator for refund. I called viator and Michelle, within 5 minutes on the phone refunded me the full cost. I would recommend this tour despite our difficulty as the half hour the gps worked, it took us on some beautiful sites.
Vehicles were easy to operate and fun. However, we did our tour on a Sunday and were not told that many streets would be blocked off. When we encountered blocked off streets, we had to go off route. The GPS unit in the car does NOT re-route you. It only picks up your directions once you get back on the route. Therefor, we spent much of the first half of the tour looking at the map. Also, three hours was not long enough to complete the tour. We had to cut it short to avoid returning vehicle late. I would recommend picking up your vehicles in fisherman's wharf, this will save you a half an hour.