I've had several Santa Cruz decks including ones labeled "hard Rock maple". I personally didn't notice a difference, but I don't consider it a bad thing. I liked all Santa Cruz decks I've had and felt that they have all been good quality. That being said I broke every one of them. If you haven't ever tried a Santa Cruz, it's worth trying either way, but I wouldn't expect a big difference with their hard rock maple. If you go on the NHS website they have all sorts of flashy titles for their decks, which might be relevant or just old fashioned marketing.