My concern with requesting a trade through
DVC for Atlantis is the same as it is for any resort that has larger and smaller 1 BR units, namely that there's no way to know which you're getting until after the fact and in every situation I am aware of, it would determine whether I would accept the exchange or not. At least with II and RCI directly you can match, investigate the unit type, then cancel without penalty if you need to including getting your week back on a request first exchange. Unfortunately that does not appear to be the case with DVC.