
It is a major pain in the ass.
You can't copy between two .zargo - Files and you can't export and import it. And that is the biggest problem with this tool, because in our company many people are working with UML, we have some standard diagrams, everyone needs to use and so on...
Printing is very frustrating, because of sometimes not printing everything or changes by ArgoUML itself in the printing-options, which render your print useless (Why on Earth should I want a 830mm margin on my A1 printout?)
In reality, if you really want to use your UML drawing for model-driven Delevopment you will need proper tools: MagicDraw, Rose, et al.
The existing OpenSource Utilities aren't mature enought yet.