If I were in Tallahassee I'd be nervous too. I'm in Central FL and I'm wary, but not nervous. Big Bend to the Panhandle isn't a bad bet, but if Izzy stalls as expected, all bets are off. The models are beginning to agree on the stall just past Cuba. The question is when would he move again. The NE turn almost always happens, which is why FL isn't out of the woods yet.
Anyway, conditions are ripe in the Gulf, but not enough to support Cat5. Cat 5 takes an extremely rare set of conditions, which don't happen often around here. So I don't see Izzy as being more than a strong Cat 3, which is impressive enough.