I agree with the others. Taking the shuttles at the airport to your hotel is easy and reliable.
Taking the shuttle from your hotel back to the airport is another story. Many horror stories, not very reliable or non existant. My recommendation: DO NOT PAY FOR A ROUND TRIP ON THE SHUTTLE! Even though you pay a couple of bucks more you aren't locked into one company. I have had problems with Bell Trans getting me back to the airport, enough so that I will not take bell trans shuttles. More than once I gave enough time (like 3 and a half hours) to get me from the hotel downtown to the airport and more than once I have barely gotten there to get through ticketing and security to make my flight. They keep giving the same excuses for the late shuttles (not enough drivers, shuttle problems, busy, etc.) that I can't count on them to get me there in time. They also ask what time your plane leaves and try to bunch passengers in order to save on trips. I usually say my flight leaves 45 minutes to an hour before it actually leaves, that way if they are a little late I don't miss my flight. On more than one occasion I have gotten to the airport after the time I said my flight leaves or about the time I said my flight leaves. Very stressful.
By only paying one way you are able to get on any shuttle and company that comes to your hotel. I did call days in advance for a hotel pickup and haven't gotten many pickups that were on time or early.
Because you will be staying at the orleans, it might be easier to just take a cab back to the airport, it should be a straight trip going on tropicana back to the airport and you don't have to worry about shuttle pickups.