I checked for updates thru play and saw the update. I checked out the notes and forums and didnt see any real issues posted about Sonar, so I did the update.
It went better than previous updates, all my libraries were authorized, so having to reload and reauthorize.
The engine seems better and loading is faster. I am noticing some pretty bad loop points on some libraries, like solo violin, that I didnt hear previously. I am going to investigate further.
I am on Win 7 64 bit and X2A 64 bit