I love love love the e-mail notification system that Audiosurf uses. I was afraid that once the novelty of using your own songs to create tracks wore off, that there would be nothing to bring me back to playing this game. The e-mails provided that replay value. I've even created a little filter on my e-mail client that sifts all the Audiosurf e-mails onto their own folder, so I have a list of "objectives" that I still need to complete. God, this game rules.
I've been having a heckuva time trying to regain the Pro score for Bob Dylan's "Rainy Day Women #12 & #35". Got very close, but was still about 1k away (The top score was 75k, and I got 74k). Now whenever I try it, my score is usually 40-50k, which annoys me to no end.
Besides Ninja Mono, I haven't really given Elite mode any playtime. But I'm having a blast using the Pro Eraser. Also, if you haven't noticed, the Friends Browser is up now, so go check it out!