(1) This sounds like a product that can’t be easily interchanged with competitors’ offerings since Chinese competitors offer “crude imitations”, at least for now
(2) From a Google search I see that the price of this product is in the range $25-250. It’s hard to see violins students who plunk down hundreds, if not thousands, of dollars for their instrument try to save tens of $s for a subpar shoulder rest. Unless perhaps it breaks weekly or something.