This was a decent upgrade as I believe most of the changes occurred under the hood as opposed to any radical UI changes. True, it feels smoother and "buttery." I do enjoy Google Now.
However, I have been using the AOKP and CM10.1 ROMS the last few months, so the change was not drastic to me as I was already used to it but they can't duplicate the buttery goodness.
Again, I am not "wowed" by this upgrade: I am only viewing it as an incremental improvement breathing new life into a quality phone. I am in no rush to ditch this phone. Its solid build and consistency more than make it dependable and useful for me. No complaints..and I can see the screen in daylight!