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Just watched the Google I/O 2010 Expense application demo showing the features and advantages of new widgets in GWT2.1 , In a simple jee web app built using spring and hibernate - for the View part if one uses ExtJs and then replaces with ExtGWT or with GWT - how easy is the View part replacement.

What are the pros and cons for going with GWT instead of ExtJs and what are the challenges to replace one view with another?. On a quick inspection, it is evident that ExtJS/ ExtGWT have a richer set of pre-built widgets. For GWT - in the above demo - the high speed that is demonstrated and the claim of fast pagination of over a million records and quick rendering)- is this a consequence of GWT design alone - and if yes, what are the performance statistics for EXTJs under such load?.

What are the other comparison points that can serve as basis of choosing one over the other?.