Just yesterday my Nexus One got it's 2.3 OTA. Of course I stayed up till 4AM just to try it out. Man am I surprised the animation is now smoother than 2.2. Took only a couple of minutes to update and surprisingly, everything went fine. No problems at all. In a matter of 20 minutes or less, I was playing PL right after I reinstalled the APK just to be sure.

My basis is when I go into Crush the Keeper and with a full party, everything goes slow-mo inside King Mynas' tomb. I mean literally laggy on the animation and movement. But now, I'm just very happy with the Adroid update.