I've heard some suggest that the quality of hops available to homebrewers when it comes to many of the classic European varietals, particularly the Nobles, might be of a slightly lesser quality. And therefore we'd often be better off using their American-grown counterparts. I'm curious as to whether anyone else has found this to be the case. And if so, what are some of your favorite American-grown hops you've found to be good substitutes in classic European beer styles?