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I think the push button start on the C6 is a novelty.
You have to have the FOB with you all the time and there is no key what so ever.
Wait until the bat in the FOB wears out and the owner is somewheres where they can't get a new one.
May sound strange, but I like the security of a key.
I like the idea of a push button -
I believe the c6 has somewhere to put the key and start the car in case of FOB issues.