Loved the idea! Great being on top of a double decker bus with the upper deck without a top! Sadly the audio often didn't match what we were seeing so we missed out on a lot of the sights. Overall though, I'm glad we did it. Being able to hop on and off was good but there were no signs to tell you where you could get back on again if you left the general area (we got off and walked over the Golden Gate Bridge and struggled to find the next stop!). The wait was 45 minutes at least once we found it (thanks to some other people who helped us).