I'm sorry for those of you who are having problems, but downloaded the update, logged right in and spent a good part of the afternoon there. My frame rate is noticably improved and packet lose is way down from what used to experience.
I had a few buggy experiences with prims becoming invisible, I'm still trying to figure out what happened there and if its a reproducable bug or was just lag related.
Have not tried out the new lighting and features yet, was more concerned with just getting back in world and basic functionality.