*MUST READ*--Flex Fan Danger--Be very careful working on old cars

After reading this I also removed the exact flex fan off a car I'm trying to complete. I hope you recover quickly! I wanted to ask about the plastic flex fans that are being sold at a local speed shop where I live, they are rated up to 8000rpms. I was hope to get the pros and cons of using type of fan?
I might still trust the plastic ones. But would never run a metal heck the one that blew up was stainless with metal riveted on both sides of the stainless and still broke.