Have only used it in one session so far but I will say it's pretty good. Uses far fewer resources than Ozone 8 and a much simplified GUI, but.. the new features are awesome.
As I tend to use the stand alone for a final master the re-balance is a work of art, allowing small changes in levels to vocal, bass & drums without any artefacts or transient change. This means not having to re-open Mixcraft to make small balance changes in the mix. How they do it can only be called "magic"
Low End Focus is effective in adding or removing punch from bass & kick and the Match EQ plugin works really well.
Perhaps one added feature is that when using within the DAW is levels levels can now be automated plus all modules are now useful to use on tracks in the mixing process - not only for mastering.
My opinion is yes, it is worth it for sheer ease & time helped because I got a very good upgrade price!