Just to second that...IGS is really tedious to work with. Export to STP/STEP or if you can get something to port it straight to 3DM would be worth it IMHO.

If your working with single parts IGES it might not be too bad, the issue really gets nasty when your dealing with assemblies with tight tolerance parts (and the surfaces get joined to the wrong parts creating a nightmare).

If you are dealing with assemblies and your stuck with IGES - a little work around you might want to check to see if you can export the assembly as individual files part files. You can then import the individual parts and edited as needed so they are clean. Then see if you can tinker with some scripting options to import the "set" into a single assembly file (Michael might want to verify if you can script the files in batch but I seem to remember something about some batch processing scripts). Just a little work-around I had come up with back when dealing with Unigraphic and Rhino (before Pro-E and STEP finally arrived at the workplace) :D

Cheers!
AW