I agree with the issues of instability with FM8. I have had versions of FM since 5 and never encountered the instability problems I have had with FM8. As an example: with a newly reformatted computer and just office 2007 and InDesign CS3 and FM 8 (with patches) installed, changing the font of a document and saving as pdf frequently causes crashes. One can delete out fontcache.dat and reboot and resave, and it will fix this. But that gets old. The issue of "corrupted fonts" seems a poor excuse for microsoft and adobe fonts in their most recent release. InDesign CS3 doesn't have these problems, but then again, it is no replacement for FM for long documents.
I think FM8 is a work in progress. As an example, see how the paragraph style menu has nothing for open type features. Maybe FM 9...