Daffodil DB / One$DB - How Do They Compare?

capt.mellow asks: "It's been mentioned that Daffodil Software has just released php extensions for their java-based commercial and open-source databases, Daffodil DB and One$DB respectively, enabling these databases as options for running web applications. Personally, I have never heard of these databases before. How do they compare to the likes of Oracle, SQL Server, MySQL, PostgreSQL, Firebird, SQLite, et. al.? Has anyone used them in web applications, and would they care to relate their experiences?"