I've used these gift certificates before one time at a local steak house and it worked fine. I just bought myself the 6 month dinner of the month club with this promotion for $24. I figure I'll save $151 over the next 6 months.
Before you buy check out the Restaurant.com site and make sure that there are good restaurants in your area that work with these gift certificates. I only know one restaurant I'd go to in my area that take the certificates. Also pay attention to the fine print on the certificates usage. The $25 certificates might require a $50 meal purchase so you're spending over $25 yourself and it probably won't work for alcohol purchases.
Use the discount code FLAVOR when buying.
60% off Gift Certificates at Restaurant.com. $25.00 Gift Certificates for $4.00 with code FLAVOR.
Now thru April 24th, 60% off Dinner of the Month Club purchase at Restaurant.com. Use code FLAVOR!
The 60% off deal only lasts till April 24th. After that the $25 certificates are $10 which is still a pretty good buy. In the interest of disclosure: I do make a commission for the links above.
For more ways to save at restaurants see my previous series: