I have been using the IBM implementation of JSf and have some comments. It is not a bad way to go but you have to commit to the IBM 'way-of-life'. They have written their own tag lib which extends the JSF standard. If you can manage to stay inside of Rational Application Developer (RAD) (which does not get updated THAT often), the integration is sometimes buggy but overall decent. Also the integration with WebSphere is pretty good. Unless your employer plays golf with IBM, I think it is better to stay as vanilla as possible.
