I don't use it much. I figure that most American companies support a long list of ridiculously left-wing causes, so much so that my decision not to buy a Ford, for instance, would account for very little.
This could change, however, now that they have added Immigration as an issue. [NEW: 2ndVote Adds Immigration as Scoring Issue, July 6, 2016]
Their researchers compiled a list of companies that support LULAC and La Raza. Sadly, the list is a Who's Who of big corporations: Anheuser-Busch, Ford, Coca-Cola, Wal-Mart, Bank of America... It's almost as if the more American-sounding the company, the more likely they are to be on the list.