I have worked with a FMS for a few years now - fantastic.
However, I am lucky enough to be working for a reputable company that has a fantastic safety ethic and FMS is not open to abuse.
While bean counters and CP's continue to undercut, take shortcuts, and/or try to manage undercapitalized GA outfits FMS will not work in GA. For FMS to work the company must embrace it 100%. Unfortunately very few CP's are even half decent managers.