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I had Onstar removed when i got my car because if the bettery goes dead and you replace it you have to reactivate onstar.The only problem with that you have to bring it to the dealer for that problem ..
Have two of the TomTom One 3rd editions in our family. Replaced my factory in-dash DVD navigation from my old car with this portable GPS. The whole unit costs less than a map upgrade on the old system and it's much more user friendly.