I rented at MCO last month and was very unhappy. I have posted this elsewhere, but in short I had over an hour wait for the shuttle bus (and called Miami twice to get them to contact the MCO office to send it) and was informed in MCO that Platinum members are not given upgrades in the US -- they tried to sell me on taking a larger car.

I will be renting again from Sixt in Europe but not in the States.