I too have been a very long term user of FO / RM for almost as long as @Vyger, running a very large one-name study and have found RM to be lagging in usability and features compared to other competitors in the market.
While not a Mac user, I do not want to wait for a Mac native client with a few features added on for the existing RM users. Rather, I would like to see RM expand the depth and integration of the existing feature set to address "live" reports, non-modal windows, speed of data entry and manipulation to name the key points.
I too am trialing Family Historian and I am liking more and more the current features and expandability through user contributed modules. In fact, FH is strongly advocated by the Guild of One Name Studies for its versatility and ability to handle large databases.
Waiting patiently for RM 8's release, but I too see early 2019 as the year I decide on the genealogy program to continue with for my very large ONS.