Are CMP Entity Beans Scalable?

[Danny]

Has anyone used CMP entity beans in a large scale web application with success?  If so can you briefly describe how the CMP entity beans were used in relation to the rest of the web app.  I've developed a prototype web app using session facades (for business logic) which access CMP entity beans that use value objects for getting and updating entity bean data.  The book "Core J2EE Patterns Best Practices and Design Strategies" recommends this approach for CMP entity beans.  It's easy enough to convert the CMP entity beans to DAOs if needed, but if possible I would like to get the CMP entity beans to work in a scalable manner.   Danny