We have always had a town car come and pick us up at the airport, take us to the resort and then back to the airport. They greet you at the baggage claim and will even make a 30 minute grocery stop if you need it. Fl. Tours helps sponsor the site and I have heard they were excellent. We will be using them in May, and if all goes well, for our trip in June.
We have never used Mears, but with 2 kids, 1 in a carseat, it is more convinent to use a towncar service. Mears is $29 roundtrip each person, but you are usually on a shuttle with other people and stop at other resorts before yours. I have also heard of people being picked up many hours before their plane leaves.
If you go over to the transportation board others will be there to help answer your question.