I'm very curious to know the experience of business owners who've used Groupon - I've just made a post questioning its value at http://news.ycombinator.com/item?id=1490096. I'd love to get HN's feedback on whether or not we should use the service.
There was another article linked in that thread about a helicopter training school having a similar experience: http://blogs.law.harvard.edu/philg/2010/03/19/groupon-market...
People in the HN thread I linked have other interesting things to say, too. From what I can tell, it looks like there's a ton of potential to get your name out there, but you will almost certainly have to be able to accept an initial loss to do so. I don't have any experience with it personally, though.
Might be hard to find a "Retail Owner" here on HN.