I got it too this morning. Was going to install the leak but decided to wait for the OTA. Everything's fairly smooth except the launcher. I have four folders with 9 apps in two and 12 apps in two others. The ones with 12 apps stutter when opening. Not all the time, but enough that it's noticeable. This also happened on ICS. Also, I get redraws every time I exit the Google Play Store and go back to the home screen after I've updated some apps. I don't ever remember that happening on ICS.
Again, everything else is silky smooth. No lag or stutter on any of my other apps. The new transitions are also smooth outside of when they occur from the home screen. Interestingly, quad and antutu scores are only marginally higher. I know benchmark test don't mean a whole lot, but I'd still expect a better score. All in all, I'm happy with the update and I love Google Now.