The San Francisco airport location was extremely busy; we waited for almost an hour. The staff were inefficient, and I saw one woman chatting away with a customer, completely ignoring the line behind. Although the rental cost through zuzuche was 1250 USD, we added insurance for about 90 USD, making the final bill 1420 USD. The staff tried to add various insurances, and you have to negotiate yourself. It's quite troublesome, especially if your English is not good.