While some 170 drivers may have chimed in (and I don't drive one), I know that we (USAirways) had no issues operating in and out of Key West with the 170s to FLL and MCO. I think we had ONE payload restriction, and that was with Republic when they tanked fuel in the morning (new dispatcher felt the flights were light enough so he had the CA fill the tanks in FLL so they wouldn't have to refuel until later that evening).

even then, it was only like a 6 seat payload hit. but still wierd.