It's certainly worth it.
We have it for the road service, with the 100 miles towing. Use that once and you have paid for it for years.
Even without that, the benefits when traveling are very good. Discounts on hotels with many chains, half price Hertz Gold and very good discounts on rentals, the ability to get free passport pictures, savings at all kinds of places like Amtrak, many factory outlet centers, theme parks, etc.
Shopping discounts like 10% off Target, 6% at dell, etc.
It's never a lot of money at one place, but it adds up quickly.