That place is legit. Rather than buying the certificates for over $12.00 in their website, I place bids on ebay and often get them for under $7.00
I have spent about $35 on certificates worth over $150! I use local merchants, and just keep the certificates for days I do not feel like cooking at home. You get food worth $25, cooked by someone else, for less than $10! Can't beat that!
Another great thing about them is that you do not have to wait to get your certificates in the mail. Immediately after buying them, you get a direct link to a site where you get to print your certificate and use it on that same day.
I strongly recommend it, from personal experience.