Another bad experience with Sixt (at MUC airport), and I had the feeling of being scammed from start to finish.

-invoice was 2.5 times the amount specified in my contract (happened with my last 3 Sixt rentals)
-automatically added any kind of possible insurance
-added 1 day
-surly staff
-took almost 20 minutes for returning to car, as the guy who collected my car was searching so incredibly hard to find a damage. I think he was even considering to get a microscope to find any.

bye bye Sixt....