I listened to the Kissimmee/Osceola County for most of the evening when Charlie hit. The system worked pretty good, although I could hear some interference (the users were reporting it too) that they attributed to the winds.
The EOC center did lose ALL power and were evacuated, so Osceola County FD was dispatching for Kissimmee from a console with a mobile radio for about 30 minutes, or so.
However, the next day the local governement folks asked everyone not to use their cell phones so they could use them to coordinate their activities, even though the system was working fine.
Warren