I am using I-Deas for part and mold design.
Telling the truth it is a good software for regular mechanical shapes, as soon as you need a simple surface forget about it, also spliting core and cavity you have hard time.Generative machinig is the worst cnc prog. that I ever used. Installing and administrating I-Deas you have to have "master degree". Now that SDRC id sold to EDS (Unigraphics) it is a dead end software i think.
I-Deas is not a program build for moldmaking, some use it like in my company but I fint it not user friendly to work with and not suitable for molds.