Very good driver. Safe driver and also worth the money. We were able to travel to Beppu -> Saga -> Fukuoka at such a reasonable price.
Driver only speaks mandarin but we know how to speak it so we don't have communication problem.
Also, driver informed us regarding the wisteria blooming status. He took a photo of it for us to see so that we will know if we will still go or not.
Will rent Ding Taxi for Japan again. Very convenient.
Our driver was extremely kind and helpful. He helped us a lot during our trip. My only concern was that he was driving a bit too fast during the rain. But other than that we were really happy with him!