I just confirmed a unit with a view that I did not want. There are other units the day before and the day after that I wanted to try. I called and had them cancel the confirmed unit and moved to the other unit. I am just wondering if I could have "retraded" the unit without calling? Actually, I know that I could retrade the unit and it is a Marriott to Marriott so there would be no fee. BUT, I am wondering if by using the retrade option if that would eliminate my option of cancelling the unit within 24 hours of getting the confirmation? I hope that makes sense. It would be nice to be able to try the retrade without having to call. But, I wouldn't do that if that meant I were locked in without the ability to use the 24 hour cancellation option. Thanks for any thoughts/experiences.