Well, lets break down the "capabilities of On Star":
1. On Star can help locate your AV after its stolen. Hmmn--If I am Mr Big Bad AV Thief, the first I am going to do after boosting the AV is grab Mr Pliers and yank that On Star Antenna. Do you think that eye in the sky can still locate the vehicle--probably not unless there's a hidden antenna or GPS locator somewhere else in the vehicle.
2. On Star can provide a cellular phone service. Well, I am pretty happy with my Nokia, great cheap rates, hands-off module, weekends and nights free, free long distance, the whole family is on this plan with multiple cell phones. How much does On Star charge per month?
3. On Star can help you find a restaurant, help you when you are lost. Well, its not a DVD-driven GPS map/screen system (like they have in Infiniti, BMW, MB, Lexus, etc). It is an added monthly charge again. If you are going off road so remote that you need to find your way back--I suggest a good Rand McNally map, a good compass, and top of the line Garmin hand held GPS, and a Nokia cell phone. On Star can't beat that. Trust me, majority of us will not drive off our 34,000 AV to the edge of wilderness that you will get lost and need On Star to bail you out.
4. On Star will notify 911 or EMS if you are in a car accident and your airbag deploys. What if you are in a roll over and your air bag did not deploy and you were unconscious--will On Star sense this and call 911? Hmmnn. How does On star know an accident occurred? If you are paralyzed and can't reach your cell phone, trust me, you probably can't reach the blue on star button either.
Bottom line--On Star was included in the driver convenience package and that is the only reason why I have it in my AV. If it was a separate option, I would not have purchased it. When my 1 year Safe and Sound expires, it will not be renewed. It will forever be a "fancy gadget decoration" in my cab for the remainder of the AV's life.