Hi dabear007
We've had quite extensive experience with translating EMS to UG. We still have an old 6110 workstation in case we have to go far back into the archives.
nkwheelguy is spot on with using iges. That works the best,
and if the models are fairly 'clean' will transport as a solid into NX. What OS are you working on?
Try to get rid of any unnecessary geometry in the EMS file before translating.