We have always used a private service. Door to door, and you are the only ones in the car. You set your own time. If it's an inbound flight, they track it and are there when you need them. We travel long distances and have no patience for using multiple modes of transportation to and from the airport to and from a flight. It's a little more expensive, but if we're going to be gone for more than two weeks, that's the way we go.
I've tried to put their number on the forum before. Admin won't let the whole number show, but go here if you are interested:
Private transportation to and from Orlando International