[quote name='dtcarson']I have used them multiple times. As long as you can find a restaurant that takes them it can be good. But get on their email list and you can get codes to get certs for 5, 3, or 2 $, so I would not take it as a reward from another site.[/QUOTE]
Ditto this. Also, they're pretty useless if you're a loner - most of the cards require a $25, $35, or $50 purchase... or more, I think.
I have a family to feed, so I've used a lot of them, but you should research the restaurant first, and never, ever pay more than $3 for a $25 gift certificate, you can find them all the time for super cheap.