I built four road bikes from Chinese carbon frames between 2017 & 2019.
All of them purchased on eBay with free shipping to USA.
The first one was sent the wrong frame size to me, filed a dispute and got to keep the frameset for free.
After completing the build and test riding it for few weeks,
I sold it to a neighbor who actually fits on it better than me. He's been riding it ever since, with close to 2k miles pedaled.

The replacement frame was sent the proper size that I ordered.
Built up in 2019 and been my all around riding.

Third frame was aero road frame, cable routing was PITA with the handlebar, only wish it had disc brakes.

Last build was a TT frameset, built up with wireless shifting.

All of them have been ridden regularly.
I don't ride nearly as much as I used to since 2020, but still very fun bikes to ride.