Works as well as can be expected over here... file browser is still screwy, but i can play windowed (sorta) and fullscreen (trying to change windowed resolution doesn't work, though, so that's stuck in default). Besides that, and the odd freeze here and there, it runs pretty smooth on normal (highest quality drives it bonkers, though...).
Here's hoping for even more work on this one post-1.0!
EDIT: Just to note, I haven't had time to try out the new (audiosurf) update yet, but I'll check into that as well.