I already rooted my HTC to ICS but went back to stock OS. The issue with this old device is of storage, there was no real benefit having the capability to load new applications but no space to install them on.
Don’t worry about my old 2.3 OS, my contract expires soon and then I can upgrade.
One more for the Wish List: Could you please add a Program Export/Import or Backup/Restore function. If you have to restore OS then perhaps via your application you can dump all the settings on OS if possible. If it’s in XML format it would be easy to edit and modify the file if you choose.