Just got off work and I'm finally able to play around with 4.3 (the update hit my Nexus 7 about 10 minutes before I had to leave, so I didn't really get to use it until now). So far, it's feeling like it's almost new again. Once all of the widget thumbnails were loaded in the application drawer, it runs like butter! No stutter at all while quickly flicking through. Live wallpapers are a little nicer now, but still a bit on the choppy side. Transitioning out of heavy applications like games still isn't as quick as it is on the Nexus 4, but it's also had some noticeable improvements. Only one thing I'm worried about is glgps, which hopefully has been resolved. I'm tired of that little bugger randomly showing up and devouring my battery.
Still no 4.3 for my Nexus 4, though. This makes me sad. At least now I only have ONE device to incessantly check for updates instead of two, though.