I originally meant for this to be part of the nav thread, but somehow ended up seperate. My though on this is for someone that is on the road alot and needs directional help, this is a sure way to stay current without adding additional wiring and an add on screen. My subscription is about to run out on my CTS and I am weighing the advantage of continuing Onstar to have the navigation feature. For me, it is less intursive than my Tom Tom and more accurate than the nav system in my XLR - even with the latest DVDs. Price is only concern as I my driving only requires this assistance once or twice a month.