Version 3.x has been specifically redesigned with usability in mind. Now you can be more productive than ever with Poseidon, using particularly the following enhancements:
Visual integration into the Eclipse IDE, with mutual updates of Java code and the UML model
Java roundtrip detects conflicts between source and model
Java roundtrip detects source files modified while Poseidon was not running
All comments and file headers are remembered when importing Java files
UMLdoc documents all elements of state diagrams
Multi-page print preview
A complete list of changes can be found at http://www.gentleware.com?redirect=changelog.