Bugs I have:
1. Words With Friends now flickers occasionally until you touch the screen. Also goes to a black screen now and then.
2. K9 mail crashes about 1 in 10 times on a close (never crashed before).
3. Dish Anywhere doesn't work on High Quality mode (does on Standard). Worked fine before.
4. Get a persistent notification on Noozxoide, that you can get rid of by unchecking notifications, then it appears again and you have to check and uncheck notifications again. At least once a day.
Found nothing in 4.3 that changed anything that I use. May go back until there's a 4.3 update, unless other apps beat Google to it.