We have used Magical Express many times. Both from the airport to our
DVC Resort, and for our return trip from the resort to the airport.
The return is especially nice if you are flying a participating airline. You check your bags at the resort (some time in the morning), board the bus, and the next time you have to deal with your bags, is at your destination airport.
It's nice to save some $$ when you can. I figure we probably save somewhere around $50 each way.
However, it is a trade off between money and time.
Travelling Magical Express will take more time than using other types of transportation.
You might have to wait for a bus at the airport, and then the bus might make 3 stops for drop offs. We usually end up on the last, or second to last stop.
The same goes for the return to the airport. They schedule your ME pickup about 2.5 to 3 hours before your flight.
IF you use ME, just be sure to schedule the time into your plans.