Used the Nokia Software Updatererer to do mine. Said it was a 1gig dl? Prob an error but i left it and went to sleep. Woke up to a new baby n9 (with all my apps removed).

Its as smooth as i remember it was when i just got it. No real difference noted yet although i wasnt expecting much.

I just hope my Gmail mail client actually fully refreshes when i want it to and doesnt hang or show an error...