I've used Groupon Atlanta for the last year or so, and have saved a bundle of money. It's all about what you value, etc. The good deals for me average about once per week. The most common is paying 10 dollars or so, for 25 dollars worth of food at whatever restaurant. If you frequent that restaurant, then it's a great deal for you.

I have subscribed to Groupon Detroit for those occasions when I head back to the area. I'm hoping for some good ones.