I haven't had any problems in Miami in the last 2-3 years. I usually go to the Holes at 25th St (which is the only officially approved photo site), but I also go to EL
Dorado store, on the threshold of Rwy9, and sometimes on the 94th Squadron. Great spots and never had any problems.
Only once I have been stopped by a Police Officer and it was because I was at the Holes and Air Force One was about to take off from Runway 8R.
For me, Miami has been pretty spotter friendly so far and I love it. I'll be around here in Nov so let me know when you are coming and we can meet and I'll show you around.
Hope to see you soon.