Pretty good

When picking up the car, they said the reserved car wasn't cleaned yet and suggested an upgrade for eight dollars, which I accepted. However, the actual bill was $47.84. Returned the car on 7/30, and on 8/15, they charged $450, claiming there was a smoke smell in the car. This is nonsense as I don't smoke, and when I returned the car, the staff inspected it and didn't mention any smoke smell. How could it smell like smoke 15 days later? The rental car customer service was unable to resolve it, so I had to call myself. After some argument, the Avis customer service said they would refund the money. It's simply extortion.

Provided a Budget car.

The line was very long, took almost three hours. When it was our turn, there were no cars available, waited for another hour. No place for family to wait, sat outside, child had a fever, told them but it was no use. Waiting outside worsened the illness, later spent over a thousand dollars for medical treatment. The front desk clerk was watching movies the whole time, worst customer service I've experienced in the US. After finally getting a car, a fault light came on after 20 minutes, had to go back to exchange it, reached the hotel at dawn. Is this really the second largest car rental company in the US? More like the second to last.

Waited for roadside assistance for 6 hours, shivering in the cold.