Just got back from a 2 week trip down to BA. Unlike my previous adventures with customs documented here, customs in MIA was painless with 2 cases of delicious wine we got from Gaucho100k. Unlike our last adventure with the Global Entry machines, when you select the box saying you are over the duty limits, the slip does not print an "X", it prints an "O". You proceed to customs like normal and then disclose whatever it is that is over limit to the customs agent at the exit. In our case, we told him we had 2 cases of wine and he said "OK, Welcome to the US." That was it. Painless. No duty owed. Very happy to see that Global Entry has added the new "O" on the slips.