Our group of 4 made the most of our short time in San Fran. Mostly it's a great way to see the sights, and knew we wouldn't want to drive and find parkingin SF. And they had quite frequent pick ups too so you could choose reasonably well how long you spent at the stops which were to your own liking. It is however, quite inconsistent with some buses you get on having a guide and some not. Some drivers are very really informative, others obviously wish they were somewhere else! But overall our group would use them again.