Kelly - I don't think you will regret it. I got a similar deal only it was $50 something at the time and I could add a family member for free. I paid a little extra to put DD17 on it but as Sandy said, I know that the girls will never be stranded and to me that is so worth the money.
Here's the link to the site where you can find out the other discounts you can receive in your area. I think you just put your zipcode in and a list will come up.
http://www.aaa.com/scripts/WebObject...iscounts/sycs/