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depends....if u coming from a 9.1 no,not really....if u have a 2.1 or 1.1 or something then yes its worth it. i typically have updated every 2-3 years as their isnt a whole lot of major changes otherwise.
it was worth it for me. took a trip to FL in February with the first generation still in the car and most of time the map didn't show any roads. it was pretty funny. ordered one right after i got back.