We booked the express option for our trip last week and wanted to share our experience. We landed at MCO around 5:30pm and after getting our luggage we went to the Mears check in area (with a gazillion cheerleaders). We were able to scan our boarding pass and only had one family in front of us. We ended up in a Meara taxi since it was just the 2 of us and our luggage which would have been fine except I swear he was speeding the whole way. When we got over to the resorts (we stayed at the Poly) he took a wrong turn and started heading away from the hotel instead of toward it and it took almost 10 minutes for him to turn around and head back the right way.
Our return trip, we were the final pickup on a bus that had only 2 families on it. Our pick up time was 2:20pm and the bus was about 5 min late.
I would definitley not spring for express again. I wanted to give it at least one try but we can get a
private car service for the money we spent.