I am glad to discover this Forum topic and to give feedback on an issue to which I gave much thought.
Like most people on this Forum, I have not moved my TMG projects but, if I ever need to, I know I can import and open the TMG Project files directly either to Roots Magic 7 or Family Historian 6.
I did however decide not to begin a new Project in TMG and instead began one in Family Historian which now amounts to about 800 people.
While using Family Historian, and going through the learning curve involved, some things occurred to me which may not have received much attention.
The valuable RootsWeb list for TMG Refugees and the associated webpages itemise the capabilities of TMG and compare them with features of potential successor software.
Comparison charts assume genealogists use their packages as they come out of the box. Some TMG users use TMG at a basic level. But many of us do not. Over the years we have adapted it and customised it. Users like myself may know very little about computing, but we none the less use TMG with customisations that have been devised by expert users and made available via this Forum. I used a lay out with a custom tool bar providing buttons to instantly add selected Tags for data entry. I used compact pre-formatted charts.
Unknown to myself, I had become dependent on customisations for entering data in TMG and when I used Family Historian, I looked to replicate them there. So the real life experience of my switching was far removed from any straight out of the box comparison.
Family Historian like TMG has a wealth of additional facilities provided by expert users. The most important of these are the free Plug ins which facilitate many genealogical tasks but cannot be tried out with the free trial download of the program. Some Plug ins carry out tasks provided for by John Cardinal's TMG Utility. Companion software Ancestral Sources, allows for rapid data entry of family groups, somewhat similar to the spreadsheet data entry form which became part of the latest versions of TMG. So. as with TMG, Family Historian is far more than what is in the box from Calico Pie. And it can therefore provide more than is outlined on the comparison site.
Trying to replicate one's use of TMG is not necessarilly the best way to embark on software that was designed with other priorities. I made a conscious decision not to use FH in the manner of a TMG relational database but to benefit as much as I could from using the things FH was designed to do - A text based programme allows for rapid opening, copying, cutting and pasting. And its graphics allow one to work directly from a visual representation of a family tree. Maps, document images and media are new experiences. I work on foreign sources and the foreign alphabets from unicode are what I need. By concentrating on what was new and different, I gave myself an incentive to persevere.The key is to find out what the enthusiasts like about a programme and do with it, and then copy them.
But I still missed things I was used to. Things which drew me to TMG in the first place. I missed the layout which allows one to see at a glance the marriage partners and surnames of siblings and children. The expert users of FH are naturally annoyed at any suggestion that their software cannot replicate the things some of us liked so much in TMG. But one of them, Mike Tate rose to the challenge. He has designed a plug in (not just for myself) which with a couple of keystrokes opens a pane giving the information on siblings and children which is such a feature of TMG. Mike also helped me customise a data input Tab which more than replicates the tool bar buttons I used for rapid data entry in TMG.
For a novice user, customising software paves the way for all sorts of errors. And guidance is definitely needed. Which is where the vexed question of Help comes in. People have mentioned the effort of changing to a new program in older age. Because FH has user-designed Plugins, it also inevitably has multiple sources of Help including a big on line User Knowledge base. I have found the FH vocabulary and the Help hard to master. Yet the same could be said of TMG. TMG itself relied on several sources of Help: Wholly Genes themselves plus this Forum, yet I also have books Getting the Most out of TMG edited by Lee Hoffman and A Primer for The Master Genealogist by Terry Riegel.
We all do research in different ways and have different priorities, so perhaps using any software in the end relies on us finding the customisations that fit our work and with which we feel comfortable. To do that we may rely on the charity of resident enthusiasts and experts. I surely did that here in TMG. Thank you Theresa and Jim as well as many others. And in Family Historian too I am dependent on the patience of people who know it better than myself, who may not approve of the way I want to do things, but who have none the less helped me tailor the programme so I feel at home there.
I began serious use of the new FH project on 30 October 2016 - that is two months ago - to give some idea of the time scale. The alterations/customisations I have made (been helped to make) have been recent when a massive task of data entry encouraged me to look for short cuts to speed the process. But using and enjoying new software does take a bit of time and in many ways my initiation into FH has replicated my early days in TMG.
I guess it is more typical of what goes on between genealogists and their software than the idea that you simply open your old tree in a new format and go on from where you left off. We blunder in, get help, follow it and the new becomes normal. After 2 months data entry into FH, I found it counter intuitive to go back and enter data on TMG.