Very bad experience. I had a car accident and they brought in a car (Mercedes) completely dirty inside and out and used some kind of a serious detergent or air-freshener. After driving the car for 10 minutes I had to stop because my head started spinning and stomach churning from such a strong chemical smell. I called Millennium and they said they will not switch a car and if I return it before the end of the rental term I will pay a penalty.