If I understand correctly it essentially applies OS-level automation onto FCPX and possibly futzes with config files as well. I’ve not heard anyone say so far that it caused any major issues. But I would take the warning to heart as there’s no one to blame/support if it wildly hoses a project/library. Still it does have some tempting features.
Noah
FCPWORKS – FCPX Workflow
FCP Exchange – FCPX Workshops
XinTwo – FCPX Training