I did the downloadable map thing, and it worked great. Although, it's frustrating as all get out when it takes out the radio while you're trying to listen to whatever it is, just so it can tell you to keep left for 112 miles or something of that sort.
I do like that it's more tolerant of updating the route where the Garmin automatically recalculates and keeps telling you to turn around--very stubborn to try and make you turn where it told you. Onstar allows you to choose to update the route then totally recalculates a way to get there using where you are instead of looking at your position as a deviation. Other than that annoying drown out feature, it did ok. But it's just not worth 8 or 10 bucks/month or whatever the price is to me just to know one street in America is a one way street. Only used it once, so it's not worth the money for our situation.
But it is cleaner than having a Garmin hanging from the windshield. I do like the Garmin's graphics MUCH better, especially now I got the little yellow/black striped Camaro or the red GMC truck icon for my "vehicle". Plus, the ability to take the Garmin and use it in various vehicles without having to buy anything extra. Just change the vehicle icon for fun, and it's all good.
Of course, onstar is only as good as the map put in it, same as the other GPS units.
2010 2SS/RS Auto, Sunroof, Engine Cover. Transformer Edition package.
2013 ZL1 ragtop #5478. 1 of 54 CRT M6 'verts.
Last edited by el ess X; 12-22-2010 at 06:58 AM.