My boyfriend and I, both natives of the SF Bay Area, decided to try the GoCar tour this weekend on a recommendation of a friend. It definitely was not the cheapest tour option, but we had a great time! Adam got us all up to speed - checked us in, made sure we knew how to work our car - and Topher was very friendly in welcoming us back at the end of the tour.
We drove all around the city, both on the tour route and off, and we had a great time navigating all the roads and sights that San Francisco has to offer. The tour/GPS was great, too - almost "friendly", despite being a machine, with lots of information that even as locals we didn't know and we found interesting.
I would definitely recommend this tour to anyone in the city - native or visitor!