A few years back i got a hard lesson on this. I was working on a chevy blazer needing a fuel pump. The gm pump was $390 and a Chinese pump was $90 the people i was fixing it for didn't have much money so we got the $90 Chinese pump. Long story short the Chinese pump lasted 4 months so they ordered another Chinese pump and i swapped it out and it lasted 5 months before dying. I went and bought the gm pump and its been in the car 7 years now trouble free.
I won't work on anything using Chinese parts anymore it's just not worth the headache and it cost more in the long run.
I watch Tony's videos but i actually was a fan of his in the 80s during the 5.0 mustang craze.