The problem with these starter kits is that they often generate so much stuff that you end up spending more time removing stuff you don't want than actually building what you need right from the start. Spring Roo was offering something similar for JSP, JSF, GWT, it has so many complex proxy classes that I eventually abandoned it. It's still a great tool for generating the DB models.
I guess anything is better than GWT these days, need to write too much code in GWT to get any useful work done.
Java&JavaScript Developer