I had a reservation and was forced to take the toll pass even though i have a sun pass of my own. My experience with sun pass is that you can add and delete rental cars on the account; but the agent that was not helping me was not willing to listen. Their option was you could ONLY use their toll pass option. I had the prepaid reservation, so was unable to use it, thus loosing my payment. I did have a reservation with a more known rental company at the terminal, which i went back to and used without a hitch. I guess i knew that it was too good to be true.... DO NOT USE THIS COMPANY!!!