We purchased 4 ticket vouchers for Blue Man Group in Boston for my son's 13th birthday. He got a stomach bug and so we couldn't go. We desperately tried to change the dates through both groupon and Ticketmaster. Groupon said Ticketmaster would have to handle the exchange since they were already paid by groupon when the order was processed and ticketmaster said Groupon was the only one who could handle the exchange. There was no resolution and we lost $228 and my son did not get his Birthday present. I spent 1 1/2 hours on the phone back and forth between the two organizations. I do not recommend using groupon for any events! It is obvious that both organizations are thriving on the mis fortune of their patrons.