My dealer signed me up for the 30 minute phone trial, and I just went with the Safety and Security Package. I've used a couple of times before I set up the website to get answers on some questions I had. The people in the OnStar Service Center are a little Detroit, if you know what I mean, but GM Customer Service folks are very nice.
I went to MyOnStar.Com and programmed all of my news, sports, traffic reports, stock, etc. I spent a little time programming about 15 speed dial numbers and then sat back to see how much I use it.
I use the traffic A LOT. I have a point on my commute where I fire it up to find out how bad it will be today. I found out the Patriots were Superbowl bound VIA OnStar as I was skiing that day. I've gotten stock quotes a few time, but the company I work for is doing so poorly I'd just rather not listen anymore.
This leads me to the speed dialing. When my baby girl had her crisis last week OnStar was a God send. I was able to use my voice prompt speed dials to call my son's school, call the doctor's office, call my work, and keep in contact with the day care. It was great that it was all just a push button away. And while my analog system in the Avalanche worked fine in the doctor's office's parking lot. My cell phone would not work at all.
Based on my experience with my baby girl, yes I will keep adding minutes to the phone (100 minutes for 2 months for $34.99 isn't all that bad) and I plan to renew in December. However the premium services aren't worth a flip to me. I'd rather have touch screen navigation thank you (hey, you already have the GPS locator in the darn truck!)