We have 3 of the 4500K and have the Maxxair Fan/Mate Vent Covers. I would say the cross ventilation they create makes a big difference and having the fans running on Auto is much more pleasant than running the AC all the time, but you're in FL and we're in Southern Alberta, Canada - apples to oranges. Overall - they should be mandatory IMO.
2013 RAM 3500 Dually Longhorn
2014 Trilogy 3650RL, W/D, Onan 5500, 8000# Axles, IS, 960 Watt Solar, 6x6 Volt Battery Bank, Freedom SW 3012 Inv/Charger