Final Cut Pro 10.3
At first glance the Final Cut Pro X 10.3 new UI is a jarring change eliciting grumbles of annoyance. Many of the interactive elements (buttons) seem much more difficult see at first, and some of them where also moved. Background tasks, share menu, and timecode are just a few that have shifted and moved. Notably someone thought it would be smart to put generators in a tab with the clip browser instead of leaving it with effects and titles (some agree with the logic of moving and others don’t). This potentially means more toggling things open and closed to adjust screen real estate – especially on laptops.
All is not terrible though after spending a little time with it and exploring things further. So far the only issue I’ve run into in updating old projects was a clip or two that apparently had color balance enabled. Maybe the algorithm changed, but removing it and reapplying solved that issue without have to color from square one. No audio mixing problems that I’ve identified and my plugins all seem mostly compatible. Slice X has issues with trying to move the tools around the viewer for some reason, but otherwise performs as it should. No doubt plugin updates will be rolling out in the near future between Mac OS Sierra update and now Final Cut.
If you organize audio by roles and sub roles there is a lot of mixing power available now to help simplify workflow and reduce round tripping the audio out for every project. In fact I probably went send anything out to garage band anymore for mixing. I’m not sure things have change much when sending audio out to an engineer however, but I’ve not had any real issues with that anyway. You can also get audio lanes split out from compound clips for to get single lanes per role while still being able to dive into subroles for further mixing. If you need to go back and adjust and individual clip level then just open the compound clip back up.