Updated immediately, with no problems. Only issue I have is that I never really knew how to reproduce the problem. It only happens under heavy graphics load or when my computer is running hotter than it should be (mostly because of high ambient temps). I don't do much heavy graphics, so I don't see the issue a lot. It has been crippling in the past, though, so count me among the very excited to see a fix.
At some point last year it seemed to switch cards on me: the flickering was only on the 9600, but now it seems to only be on the 9400. This could have also been me not paying attention.
EDIT: I just saw the briefest of flickers ... nothing like it was before, which was always marked by several horizontal lines flickering across the screen.