I got the update overnight (probably around four-ish; I'm a night owl), and after noting some of the claims here, I'll share my experience thus far:
Scrolling on the home screen, notification panel included, are smooth as silk for me. Moving quickly from the home screen (e.g., coming directly from an app) and drawing down the notification panel creates a little bit of lag, but again that's under the circumstance of jumping quick from one thing to another. It does very much seem that the OS is reallocating its resources more efficiently.
Can't comment immediately on increased WiFi speeds, as I've got a bit of network traffic going on (for reasons I'm sure you can guess. And it isn't porn, you dirty robo-pervs), but I can test that later.
I have experienced no back-lighting issues on the physical keyboard; I did not need to reboot. The improvement to the virtual keyboard in landscape mode is fantastic, and I've had significantly fewer missed letters.
The camera is much improved. I was unlucky in that my auto-focusing on near-field objects (barcodes, primarily) never worked itself out; this update fixed that problem.
I re-synced manually in the sense of turning off all my syncing and back on, and in the case of Facebook, I had to log back in. I used the built-in app for this, curious to see if or how it had improved. To me, it seems improved, if only slightly; nothing feature-related that a cursory glance revealed. I never got to see my friends' feeds in a chronologically appropriate order, and now it feeds as an accurate timeline. I experienced no problems with my contacts.
Googamaps (as my young nephew pronounces it) does seem to load much more rapidly. I have not as yet tested the directions.
And finally to the browser. It has indeed become choppy. In my experience, in briefly testing a few full-feature and mobile-optimised sites, the choppiness and lag is intermittent. You'd expect a more robustly designed site to cause more problems, and that's certainly the case, but it sometimes almost feels as if the system is having trouble freeing up the resources pushing the pixels for the really multimedia-rich areas. Scrolling can go from choppy to smooth within the same page, I've noticed, depending on how much stuff is going on within the part of the site you're viewing. I had this very forum scrolling quite nicely, but a site like Boy Genius Report (the non-optimised version) is a nightmare. Aside from all that, I'm not getting any unreasonable load times for pages.
My guess is that Google/Moto/VZW will get wind of the browser issue very soon, and will work very quickly to tackle it. Perhaps it will be resolved in the next update (January 11-ish), but I can't see the issue going unresolved for that long if there's a groundswell of agitation. Then again, it might. I'd remind everyone that we're very fortunate to being in a situation where the fixes for this thing are pushed out as quickly and proactively as they are.
Anyhow, good luck to the rest of you lot. I'm very confident that this will be taken care of. If you think of ironing a shirt or some such apparel, there are times when ironing out a wrinkle may create a wrinkle elsewhere in the shirt. Let Google keep ironing.
Mods: apologies if this post doesn't fit with the intended topic. Moderate as you will.