It sounds like Groupon isn't the problem in your case, it's the service making a deal like that with no limit. Groupon's can/do have limited quantities, and th

It sounds like Groupon isn't the problem in your case, it's the service making a deal like that with no limit. Groupon's can/do have limited quantities, and the dental place should have probably used that. They cooperated and gave you a refund (I've received a refund as well before, the customer service has been amazing), I don't see how you would point the finger at them before the business on the other end of the deal. Anyways, that would definitely piss me off a bit as well, crappy deal. I'll keep using Groupon, I can't pass up half off concert tickets and delicious foods :D. Edit: Oh, this guy says it much better: http://hackerne.ws/item?id=1698788 http://hackerne.ws/item?id=1698788