I went to ion cars two years ago because it had very good yelp reviews and bought a ford focus from Salem.
At that time, I was a bit skeptical and wondered how come a car dealer could have so many five-star reviews. After two years, this is clear to me that this is probably one of the best place in San Francisco to buy a car.
The deal was pretty good. The price was well below KBB, and the car seemed to be in a very good condition. During the two years, I did not have a single mechanical problem, even though the car was five years old, and it was therefore very cheap to maintain and easy to sell back.