The restaurants at restaurant.com list their terms. Many restaurants require that your total food order must come to $35, $40 or $50 in order to redeem the $25 off certificate. We try to pick the restaurants that have a low redemption rate of $35 or $40 instead of the restaurants that require you to purchase at least $50 to keep our costs low.
It is also important to remember that when you tip, you should tip on the food price before the discount is applied. Most restaurants state that an 18% gratuity will be added to your bill, but I have only had one restaurant actually do that. We do try to leave a nice tip if warranted (and we usually find it is warranted, especially when the waiters are going to have a messy 16 month old to clean up after when we leave).
If you have been wanting to try restaurant.com, try it now.
This post is linked to Works for Me Wednesdays.