BART, The Bay Area Rapid Transport
I have taken BART trains practically every day to go to work and back for over two decades now. Although the system is a bit old and has experienced more breakdowns lately more than anytime in its entire history, it is still very efficient, relatively safe, and reliable. Thousands of people use it everyday and rely on it for their means of transport within the Bay Area.
I used to dislike the seats in these trains in years past. When new, the seats felt clean and smelled it too. After years of use, however, they did look very gritty and absolutely filthy. I know people who placed newspapers on these seats before actually sitting on them. Thank goodness, BART officials upholstered the seats with the rubbery blue leather. I no longer cringe when I actually sit on them now.
Sometimes, taking the BART train from SFO may come out cheaper than taking a cab when heading out to the city. A cab ride will run you somewhere between $50 and $60. The BART ticket costs around $7 per person. However, if there are plenty of you, then taking a cab might be better.