I cannot recall to have used warranty claims that much for Chinese products, haven't bought THAT much either, mostly accessories and all my wheels.
But I do have to give +10 points to "timetec bike" which are selling wheels. Extremely good customer service, ordered a custom wheelset for my gravel, pretty decent wheelset at 999 grams. Very satisfied and pleased with this one, I then ordered a pair of road wheels.
Somehow the front rim of the road wheels developed a white coating on the entire rim. This turned out to be a failure/problem with the matte varnish coat that they had used. The varnish did not protect from UV, so the UV from the sun reacted with the carbon and made it all white
When I contacted Timetec bike he would discuss this with his engineer, he then came back to me and admitted fault and would replace the rim free of charge.
But as I would had to pay 100 dollar for a LBS to have the wheel rebuilt I asked for two new rims in case there ever would be an issue again or one of the rims would crack as they are extremely lightweight.
I received 2 new rims for free on warranty so there are some Chinese companies that actually honor their service and take responsibility
With that said, I have a custom modified Tarmac SL7 copy on the way from TFSA, take on wood it is flawless