I've been to Zorba's and used a Groupon, everything was fine. When I saw another Groupon for Zorba's I bought it and saved it for a time when I would be able to take my younger daughter since she likes gyros. I experienced the same situation as Philip (below review) except the owner decided it was wise to show me the math of deducting $10 from $18 as if I wouldn't understand his dilemma of 'trying to run a business'. I was insulted and will never step foot in Zorba's again.
As a sales and marketing business woman HE should understand how detrimental his ethics are to his business because I will certainly tell everyone I know to avoid his business like the plague.