I've been using them for years and have yet to have a problem. Once, my DH took the boys to dinner only to discover after dining that they were no longer accepting the certificates. The restaurant had placed a notice of this on their front door, however neither my DH nor the boys noticed it going in. Because I had bought at least six of these in advance and had half as many left, I contacted Restaurant.com. They replaced them with generic certificates that I was able to use at other restaurants of my choosing.