Out of all these findings I started using SmartClient 5. Initially we faced some issues but as SmartClient matures I find it interesting in many terms: 1. APIs doc help and examples 2. Flexible controls 3. Forum
Today I am working on SmartClient 8 and few on my GUIs are in production running successfully. Actually the great help with SmartClient is that you find every thing at one place. No need to dug many other sites that is hard to do for any other open source RIA framework.