Aftermarket wheels...how safe are they??

Even though I like to say “Steel is Real!”, my wheel and tire dealer said he had too many complaints and warranty jobs on the offshore production steel wheels he used to sale before the quality bottomed completely out. They would flex so badly they affected the the handling of the vehicle, and then would show up with fatigue cracks in them. I’ve been wondering about the aluminum aftermarket wheels, I guess this confirms my suspensions!