There was a point where "Made in China" meant inferior quality and materials and supporting poor labor conditions and artificially low prices due to government subsidies, but that is surely going away.
I am sure Viltrox and a slew of other Chinese lens manufacturer will eventually get parity with OEM glasses in terms of image quality, AF speed and accuracy, etc, but not quite there yet.
This lens costs a lot less than an OEM lens, 459 EUR here in Europe, but what will the lens be worth in 2-3 years when they are on Mk II or III of the same lens with distinct improvements? My concern isn't the initial purchasing price as much as the total cost of ownership of an item, availability of service in Europe, variance between copies, etc.