The most useful part of process4.biz is its ability to export diagrams in various formats to create and modify my documents. Also, I like the intuitive interface. The tool is a little expensive for my needs. I don't like the fact that it is so difficult to get used to. Maybe this is because I am a beginner and have a simple user interface.
The software is easy to use and very intuitive, so it is easy to learn. It is worth trying it out before making a final decision, since it costs quite a lot.