A lovely opportunity landed in my way to try Talend Open studio. It was a breeze to adopt Talend Open studio. In specific, I used 4.0.3 version. The highlight is, it is built on top of eclipse platform, enabling any developer with fundamental knowledge of Java language to be easily extra productive. I cannot comment by comparing this with commercial tools in the market as I haven't used other tools before. One aspect I am sure is... the arrival of open source tools in the BI space will soon change the BI solution offerings are made. I am convinced Talend as a basic ETL tool and not sure if this can be used for "Heavy lifting".