Hi! We just got back yesterday and Magical Express worked great for us.
We arrived Thursday around 6pm at the Orlando airport, followed the CMs with the Mickey hands, checked in for the bus and waited less than 5 minutes to board. (We did have the booklet and luggage tags, but other people around us didn't and they didn't seem to be having any problems.)
Our bus went to AKL and then on to CBR. We were at the resort, checked in, and in our rooms about an hour and a half after we got off our plane. We headed out to DTD and by the time we got back, our luggage was in our room.
For the return Monday, our flight left MCO at 3pm. We took the 12pm ME bus from CBR with no problems. We flew Southwest and the driver put our luggage under the bus and we checked in with it at the airport. The check-in line was long, about 30 minutes. We overheard one of the workers saying that things were really bad when the cruises came in on Fridays, Saturdays, and Sundays and often it would take almost 2 hours for checkin! So, if you have the chance, I'd suggest checking in online if you can.
Anyway, we had a great experience with ME and will do it again if it's available on our next trip. Feel free to PM me if you have more specific questions.
Have a WONDERFUL time!