Oh -- if you use them, just be certain you tell the place you have the coupon upfront, right away. Some places change ownership and then won't take the coupon. I think they're stupid and missing a great PR opportunity (and we usually leave when they won't take them) but you can't force them to take them, so it's best to know right away if they won't. Also, some places will automatically add an 18% gratuity to your check -- most don't but if they do, it is written there in the rules of use.