I booked a full size car and was offer a decent VW Passat with leather interior and about 2000 miles on it. I asked if upgrades were available for Platinum members. They said they upgrade Platinum members one level and offered a Toyota Corolla or Chevy Malibu??? I stuck with the Passat and was happy with it.
There were no BMWs at this location but they did have some Mercedes-Benz cars and SUVs.
I didn't take the shuttle so I have no comments on that