Weed, I think you and I may be the only people on this forum that have EI, and I have not attempted anything in with FBX. You may want to ask over at CGtalk, the EI forum is pretty active...small but active.
http://forums.cgsociety.org/forumdisplay.php?f=186
Right now everyones in a frenzy about V7 coming out in a few weeks, so I don't know if you will get much help or not.
Brian, EIAS is fast....very fast...WOW fast, and I think it can handle more polys that any other animator. Its renders are clean and sharp...very clean and sharp....WOW clean and sharp. oh did I mention that it is the animation/rendering package used for movies like Star Wars.
Sorry Brian, im just being a smart ass. It really is a very good 3D software, and I think version 7 may put it back in the VFX studios again.