I always had Packaging but never got any training on that app. Since the upgrade to PR4 i started to look into the packaging software in Signa as we do a small amount of packaging and lots of envelop designs that require interlocking etc. The basic packaging seems pretty limited as you need to have the imposed die forme, i cant seem to see the use of that. I have activated a demo of the Pro version that works very well. I have spent a bit of time and self trained myself and managed to get some good results with complicated folding cad files that i created or edited in illustrator, exported as a dmg cad file and then imported into Signa/packaging. Would love to get my hands on some more info or training though as there is no 'help' menu that i can find in the packaging software that runs of the back of signa.
