I've used this forum for a couple of weeks now, and I must say that compared to StackOverFlow, it's really lacking. Most answers are quick pointers to somewhere in the docs and they're not really helpful. When I click on my profile, I can see that I've asked 10 questions, but I don't have the links to them. I understand that Sencha is not in the forum business and they shouldn't be dedicating much time to making this on par with SOF, but support is critical.
I do both native iOS and Android, and I feel like I could build two native apps in less time than one ST2 app simply because there's so much more support. Google moved their Android support to SOF, so this isn't unheard of. SOF has built an "economy" around getting people answers to their questions.
Over 125,000 questions tagged: iphone:
Android 165,000 : http://stackoverflow.com/questions/tagged/android
About 300 questions tagged sencha-touch-2:
ExtJS is getting better: http://stackoverflow.com/questions/tagged/extjs