Groupon

I did a brief search and couldn't find this topic on here but I stumbled onto this the other day (In the courier?) and thought it would be a great way for local businesses to drum up some action. I was pleasantly surprised to discover that Louisville is included. I am not using it personally (yet) but I think it could do well for a local restaurant/small business.

http://www.groupon.com/louisville/subscriptions/new

Anyone familiar with it? Good times or headaches?

For businesses:

http://www.groupon.com/groupon-works

I signed up for this, but it's my understanding that it's not officially up and running. That is to say that there are not any coupons yet available for Louisville groups. I could be wrong...