All OS's are written by RIM/Blackberry and then sent to the carriers for testing and release. They are the same other than bug fixes. You can always downgrade to the AT&T version if you don't like it. It doesn't change any branding on the phone, splash screens, or Service Provider information. All that remains the same. You just get the bug fixes. The biggest one is that the calendar issues are fixed in the Optus released version.
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