I'm using ExtJS since the beginning and today I found some (nice) surprises: the new web site, new examples, etc. that, as usual, looks great.
Then I found also a new product: Ext GWT, that is a GWT Java wrapper that use ExtJS
to create the UI.
I have one big question: why you selected this product (Ext GWT) instead of GWT-Ext (http://gwt-ext.com/) ???
I have nothing, personally, against Ext GWT but just looking at the examples (http://www.gwt-ext.com/demo/) you will IMMEDIATELY see the difference: Gwt-Ext is much more complete than Ext GWT.