title: Grails with Vaadin plugin, is it the right choice?
body: <p>For my organization I am evaluating RICH technologies for our next projects.
  We are currently using grails 2.1.0 and very happy with that, especially with groovy and gorm and we would like to stay with that. The idea is to extend grails with some RICH framework/library. Currently I am evaluating: grails plugin for ZK, grails plugin for Vaadin, knockoutjs, angular.js, ember.js.</p>
  
  <p>I already received a feedback from my colleagues who worked with ZK (no grails) and their conclusion was: cool, but forget performances, ZK goes to the server every time you do something at client side.</p>
  
  <p>My question is: is this also true with Vaadin (plugin for Grails) ? How does it react with heavy single page applications? and what about Bambi? can this be an option?</p>
  
  <p>On paper grails + Vaadin is what we need: we want to write groovy/java, not xml and surely not javascript. Is this the right choice?</p>
  
  <p>I know my question is very generic, but I am just at the beginning of the evaluation...
  Thank you for your attention!</p>