We just pushed Siesta 1.0 out of the door. If you've faced issues using Selenium to test Ext JS, then you know why this tool will help you. Sencha community contributors with > 500 posts get 70% discount on the price.
Currently we are doing a 50% discount on the license fee, so grab it while it's hot!
More info in the Sencha blog http://www.sencha.com/blog/introduci...ool-for-ext-js