Dietrich Kappe wrote a nice article about IT Mill Toolkit 5 on Ajaxian. He summarizes the value proposition of IT Mill Toolkit as “State and control logic stay on the server, so security compromises that exploit client-side state and logic are more difficult to pull off; developers can work in one language and, for the most part, ignore the fact they are writing a web application.” and comments about GWT transition “I’d like to see the other server-side frameworks follow IT Mill’s lead in using GWT for the client side”.
Take a look of the full article