I get the impression that in Australia Silverchair are kind of rock royalty.
In the US though, they're forgotten - I have friends who were really into Neon Ballroom who didn't know that Young Modern Station had come out, let alone Diorama.
I think the Vines are more popular based on recognition though - in the popular memory of the US, "Get free" is fresher than anything Silverchair has come out with.
*uses this has an excuse to post this awesomely long Silverchair gif*