I gave OnStar a try but it was not worth it to me. All the music I need is in my phone, the GPS in my phone is WAY better than what Onstar has. The couple of times I did try to use onstar it was unable to find a major Hotel that my 15 year old Garmin has in the data base, Onstar said that this 25 year old hotel is to new to be in their database but they could get me to the center of the city it was located in. Another trip I tried to get to my aunts house, she is the 4th generation in that house at that address, Onstar said it was to new of an address to be in their database but they could get me within 20 miles of it. The one time I did find an address that was in their data base it took me down a road that dead ended at a river and expected me to be able to drive across the river instead of using the bridge that was 2 blocks down. The times I used onstar to ask question about my car they were never able to give me an answer.
In areas that my phone has no coverage, Onstar also has no coverage.
Onstar is just a very expensive cell phone that can only call one number. With as poor of a job as it does on locations, I wonder if it would be any help in a crash or if it would end up sending help to the wrong place. In a bad crash it is realistic to to have the antenna torn off the roof rendering onstar useless.
I sure wish there was a way to completely remove it from my cars or better yet not have to pay for it in the first place.