I buy certificates from them all the time, sometimes up to 90% off. The key is to read the fine print. Every restaurant has their own policies on when/where/how they can be used.
Yes, just check the rules. They aren’t that hard to follow. My next move will be either a steak or seafood restaurant. I only wish Charlie Crabs which is near me was on the Restaurant.Com list.
I have also used them before. I subscribe to www.couponmom.com. They advise me when there are sales at restaurant.com. Last week they had the 90% sale going on.
Like another Freeper posted , make sure you read the fine print for each restaurant.