Just sign up and book (see what they did there?) the car you want on the app, and a white-glove concierge will drop off your new wheels at your home or office (or anywhere you specify) and pick up the one you're returning.
You won't have to worry about being stuck with a lower-end vehicle, because the service only supplies Cadillac's top-level models – the XT5, Escalade, CT6, and V Series performance models – all in Platinum trim. Plus you don't have to deal with the costs and hassles of maintenance, depreciation, and registration. Cadillac takes care of all of that for you.
Cadillac will initially launch the subscription program in the New York metro area, with plans to debut in other markets soon.