Sweet. What differences are you noticing? I've been on it for about three weeks now and it looks like the battery life is a bit better!
Love the small but definitely noticeable design differences too, ahh so good to be rid of those snot green symbols in the status bar. And the unlock pattern dots look much better with a bit of transparency on them.
The only really bad thing so far is that the lockscreen has hung pretty badly on a few occasions, when I've entered the wrong unlock pattern and then tried to re-enter immediately. But this could be because NiLS Notifications Lock Screen hasn't been optimized for KitKat yet.
Overall though it does feel smoother to use - my love for my trusty old Note 2 has been rekindled