I know a bit about collecting and analyzing customer feedback to rate companies' products and services.  For that reason, I like the Diamond Certified ratings as a method for rating local companies.  There are probably more B'game companies than the seven listed in the print listing in the San Mateo Mercury Times, but these are the only ones that list a B'game address:

Peninsula Prime Motorz (621 California), Autohaus Schmid (1213 Rollins), Prime Time Athletic Club (1730 Rollins), All Natural Stone (1575 Adrian), Carmen Miranda at Alain Pinel Realtors (1440 Chapin), Rebarts Interiors (247 California) and Bay Area Window Pros (215 Highland).

According to the methods used, they all get a 90 or better rating from real customers along with some other criteria.  Kudos to all.  Shop B'game!