I love Magical Express but I do not like them handling my bags if my flight is either early (before 1 pm arrival) or late (after 7 pm) arrival. For those flights, we check our bags, pick them up and take them to the bus with us.
My objection for the early flights is that I like to be able to swim in the afternoon after going to the parks. Because the checkin time is after 3, I like to swim and use the locker rooms for changing. I can do that if I have my own bags and Ihave checked them at bell services. If ME has my bags, I am out of luck.
For the later flights, my objection is being awakened when they deliver my bags.
It's just easier to handle them ourselves. (But we are not juggling car seats and strollers --- which would be enough to make it worthwhile to let ME deal with the bags).
elaine