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Please don't get worried until we are told otherwise. Understand that GM wants the car to be correct and have happy customers. Sure, they might be having problems but it's better to correct it now rather than after ya'll have your cars and are pizzed. They've done a wonderful job up to now and there's no reason to expect things have changed. Since it seems they're meant to be easy to change anyways even if they aren't ready to go a SRP maybe they can just ask to have the cars serviced and install them later after any bugs are worked out.
JMVHO.