The service was very poor. I had booked a comprehensive insurance in China which covered everything, so no additional fees were supposed to be charged, except a $100 deposit taken at the time of paperwork. However, when returning the car, the rental company mentioned there was a change in settings. I kept insisting that nothing had changed, and they suspected it might be related to the GPS. I showed them the Chinese GPS device I brought from home, and they immediately said there was no problem and that the $100 would be refunded soon, with no additional charges. However, due to the lengthy argument, I missed my flight by 10 minutes. After returning to China, I noticed a charge of $17.83 on September 06, 2015, which I suspect might be for toll fees or something else.