When should I use RequestFactory vs GWT-RPC?

Question

I am trying to figure out if I should migrate my gwt-rpc calls to the new GWT2.1 RequestFactory cals.

Google documentation vaguely mentions that RequestFactory is a

Answer 1

I think it's really helpful if you have a heavy pojo on the client side, for example if you use Hibernate or JPA entities. We adopted another solution, using a Django style persistence framework with very light entities.

Answer 2

I find the idea of creating Proxy classes for all my entities quite annoying. My Hibernate/JPA pojos are auto-generated from the database model. Why do I now need to create a second mirror of those for RPC? We have a nice "estivation" framework that takes care of "de-hibernating" the pojos.

Also, the idea of defining service interfaces that don't quite implement the server side service as a java contract but do implement the methods - sounds very J2EE 1.x/2.x to me.