After awhile, you'll get 'the touch', and be able to close them once without slamming. This is a symptom of any frameless windowed door. They help a little by lowering the window slightly, but it still requires a moderate push to close.
I'm not sure how many of the models have a frameless window. Many of those ordered probably have the comfort access package, which includes the soft-close doors, then you'd never notice. I resisted that package because it was yet another thing to go wrong in the long-term, and it adds weight, too - the GT is already heavy enough!