I used to use groupon for lots of local services in my town. I haven't used it for 4-5 years and purchased 2 slots for a sensoryi-deprivation tank. After the purchase, I tried to find the phone number and address of the place and there was no reference on who to contact. No website, no names, no answering service or machine to take messages (mailbox is full), no emails... It was then I realized that I may have been scammed! There was a reference to a building location, so I jumped in the car and drove there. Turns out, Groupon will not update the contact information for the service (phone number, names, addresses, website, general information). The guys on location said it is Groupon then who gets to pocket the lost funds. I am horrified! Not the exchange that I remember long ago and I will not be using them again... ever. The Groupon concept was unique but they have no sustained crediblity after this incidence.