The general view on cruise critic seems to be that it might be worth the price to park at POM because of concerns about service and security at the off-site places. Although security at POM itself cannot be taken for granted, it would appear that the history at POM is much better at POM than the off-site places. Other ports we use with a car (Baltimore, Canaveral, and Everglades) we have used off-site parking and would again. I am not sure we would in Miami.