Yeah, I was wondering about that, if it's actually a good sport for GSDs. I think they might allow you to roll the frisbee instead of throw it in some games.My opinion, on this sport for the GSD, it isn't suitable.
This breed is not always going to be light on their feet for landing, and injury as well as the body eventually showing wear will happen. Sure, they can launch, catch and look amazing in photos but is it fair? There are other sports the GSD can excel in.