I have flown 2 flights so far and this is my conclusion. Please note my experience may differ from others.
1. Performance and systems have improved vastly. Updated integration with the EFB/Simbrief flight plan import has improved with all available info now loaded directly into the MCDU. However, I have found that the flight path vectoring (magenta line) is calculated incorrectly when the first waypoint is in the opposite direction of the takeoff runway. A parallel vectoring is calculated until the abeam the airport and then resumes direct-to navigation to the first waypoint. This happens when no SID is selected.
2. The engine sounds no longer have that deep growl when starting up and fuel flows into the turbines. Instead, a very annoying whining noise is noticeable when starting the engines, taxiing and during cruise. Personally I preferred the "old" sounds.
3. The Final App path when flying an RNAV approach is broken. The aircraft oscillates up and down constantly and takes a distinct nosedive when crossing the final approach fix. This happened on both flights at different airports. Before the update the aircraft flew RNAV approaches like it was "on rails" which made it very easy to control.
Again, my experience may differ.
Have a good day folks!