I rented from a Munich city Sixt location, reserved an X4. Given the minimal inventory at the location they didnt have my rented class on arrival so I was upgraded to an X5 xdrive30d M sport. Success, amazing car for driving through the mountains. I ended up returning to Munich airport on the back end as a one way rental (very minor charge). Used Chase Reserve card for CDW insurance. One note is the return at MUC is a semi cluster since all rentals are returned at the same exact spot. Try to get a receipt on the spot, I didnt and was worried for a day or so they were gonna pull a fast one... turned out fine. Good luck.