Perfection, one of the great things about spending a bit more at places like Cafe du Bois is you get to experience a meal prepared by chefs more skilled than you and I using techniques and recipes we may not have tried. It's about trying something different to get outside your comfort zone. Once you find something interesting and new to you, you attempt to cook it yourself at home. It's not uncommon for chefs at places like this to come out and answer questions and offer tips if you ask.
Not only do you get to enjoy a great meal, it can serve as an investment in becoming a better skilled cook.
I have always felt that the food there is very good, selection is varied, service is excellent, and exactly what Warren said - it's different! Great lunch destination. You can always hear the conversation with your lunch partner(s) in a nice atmosphere.
You will most likely just get a credit for the $15. I ordered a couple things from Living Social and the company ran out and all they do is give you a credit. Doesn't sound like good judgement to not honor their coupons unless they are closing.