I have run the update and it looks good. I think each update seems to make Mixbus more stable and solid. There seem to be some improvements with a few new features added. And quite a few fixes.
New features wise the polarity maximizer looks to me rather special with 3.4 It analyses your grouped live drum tracks and determines the best polarity setting for each track to achieve the loudest and the 'best' sound.
The video on this is here:
https://www.youtube.com/w...k&feature=youtu.be This is a great feature to have built right into your DAW. I think the measurement features overall now in 3.4 are excellent. It is making me want to track in Mixbus now and see what that process is like.