It's like getting $22 off your bill.
Ask your server before the meal if they take it. When you get your check, just put it in the billfold with payment.
You can only use 1 per restaurant per 30 days. You can use different a different coupon in a different restaurant, just not the same one for 30 days.
You cannot combine coupons even if you split a check. 1 person per party may use a coupon.
From personal experience, I eat out a lot in NYC manhattan (4-5 nights a week). Most place I eat are about $20-35 plates, $80-100 per 2. Restaurant.com had a huge selection of very good places in all different price ranges. Most of the coupons can be used on a bill $35-50 or higher which is easy. They do an automatic gratuity but it is modest. I usually add 5% if service was decent. Anything higher end like nobu, jean george, modern, you don't need a coupon for cuz if you do, you can't afford the place.