Whatever.
I have a 2009 and a 2011, and no intention of pressing that blue button on either one. I don't care how accurate the system may be, the graphics SUCK.
I recently paid the $89 to Garmin for each of my Garmin GPS units (Zumo 550 and Nuvo 1450T) for lifetime maps. That's all I'll ever need or want. I want no subscriptions at those OnStar prices, thank you.