Florida has warm waters, which is basically what we have in summer here in the Med. I changed to copper coat last time I had to do the anti fouling and so far I can say I am more than happy.
Yes, it is more expensive than a normal anti fouling, but it lasts for 10 years and after those 10 years it just needs a light sanding, one new layer of copper coat and you are good again for the next 10 years.
When we hauled out the boat in Turkey the hull was as clean as it could be, not a single barnacle on the hull, no damage to the copper coat, so it had worked perfect.
What were the cost ? I had to sand blast the hull, apply the copper coat and sand it before the boat went into the water. In total I paid little over 5000 USD for the whole thing, but knowing I won't need to do anything anymore for the next 10 years I basically save around 3000 USD every 2 years. That means 15.000 USD savings for the cost of 5000 USD. On top of that I don't need a diver anymore to clean the hull, which is another 1200 USD per year.
If any of you were ever contemplating copper coat, I can highly recommend it, but just make sure it is applied by someone who knows how to do it. Do it right and it works great, do it wrong and it won't work at all.