I have done Groupon for about a year now in the Chicago area. I know most major metro areas have them across the country.
I get an email for the hot items usually. They have daily ones, hot ones like the $50 Gap card for $25. I usually pass up 90% of what they are offering because honestly, we most likely would not do it anyhow or go to the eatery.
When a local restrnt we have dined at for the last 20 years, had a $50 for $25, I bought 2. We went last week and ordered our normal fare. It would be a $75 dinner for both DH and I with an entree, one dessert, and each of us having a wine or beer. If we had an appetizer, it would be closer to $100. So we had to add about $35 to the bill but we enjoyed it. We will use the other card late fall or winter time.
A friend who told me about Groupon is constantly forwarding the email and saying- LETS DO THIS!!! great place!! When in reality, most of the places are located an hour or so away in a very crowded neighborhood. Between getting a sitter etc and going, it would not be a "Deal" for us.