Goupon offer good deal but it is very difficult to book an appointment with the providors It looks like a capacity of services of those providors is not analyzed so they sell over their capacity and the Groupon customer get affected beciase Groupon lack of business good practices On the other hand Groupon give ONLY 7 days to return the Coupon and usually the period you are traying to get a appointment is greater than that so you get 'stuck' with you money hold and unable to get the service you paid for