It's quite good actually. Got into one last week in Thailand (during a Grab ride) and I was quite surprised by the quality/finish. It's on par with all the cheap city cars we have in Europe : Not high-end, basic but not badly made. Enjoyed the USB-C chargers for passengers in the back :P
You’re not wrong - BYD is one of the best brands out of China. Was in Indonesia and rode in a Wuling, a Chinese co-op with GM, and it was a bit primitive - the ride was pretty rigid. The BYD in Thailand was by far a more advanced ride, both suspension and outfitting in the interior. Not flashy (they have better models for that) but solid and comfortable.