Yes, Master, I do work in mac (already printed 10 advanced math books) the screenshot i've posted is an answer to the same question you have, attached for me by the Design Science Support Team (another thing to remark, they always helped fast and precise).
The importing process is the same as images, once the EQs are converted i have to import them one by one.
the correction is by: reveal in finder --> drag to mathtype icon in dock --> correct --> save --> back to indesign --> update --> check scale 100% --> adjust if neccesary
LaTeX and TeX are auto-converted in MT, never faced a FrameMaker until now.
Fonts are well managed in MT by a kind of Paragraph Styles called Equation Preferences, you can set the sizes and spaces for every aspect of a Equation. As they are treated as images by InDy all the font work is made inside MT, you can manage several styles in a book with ease.
Baseline adjustment is a hard one, i have to make several character styles to align EQs or Fractions depending on the height of the image
the bad thing about the MT, as you can see, is the image treating of the eq, and the lack of overprint. i've tested MathMagic too, when i started with the Math Book projects (7 years ago) and the reason to go with MT was integration with MSWord, i also remember testing mt.importer and mt.editor veeery good InDy plugins parterened by adobe, but expensive (almost 600 eur.)
Now please, Master, Obi-wan Kenobi enlighten us with the benefits of MM as i am ready to switch to the Force Side if is that good as you claim.