I downloaded this software last week.I knew this is a good UML tool from lots of comment on web and thouht I can learn this tool.
I drew some diagrams with it and felt a bit difficult.But I think,every tool must be spent time to learn it then it will present it's effect.
The main reason that I want to learn a open source engineering UML tool is I shouldn't use D version software forever.I think our project should use all kinds of open source engineering software or component.
But,on the other hand,we live in a real world,this is a matter should be thouht carefully.In spite of these all,I decided walk forward according with this mind.I hope every friend who read this give me your suggestion.