MIA is fine, have been issues in the past but I wouldn't hesitate to use it and frequently do.
Fuel is as per stated organize to avoid a crippling call out fee.
Good grass tie down area 100m from GA terminal/aero club, tie down cables provided, ignore the sign stating automatic sprinklers, they are manual so shouldn't be a case of a free wash.
No landing/parking fees for private ops at least of a month ago.
Good aircraft security.
If you wanted to avail yourself of a taxi through aircraft hangar to avoid leaving your aircraft in the sun contact the airport manager (not the ARO) and he might be able to organize a short term rate.
Much shorter drive into town than Wentworth.
Longer sealed runways as opposed to gravel/natural surface, less prop damage.
Not trying to dis Wentworth, just offering a balanced view.