We have done the tequila lunch twice now, last year and this year. Both times we have thoroughly enjoyed it. Guess we wouldn't have gone back a second time if we didn't like it the first time!
You start with a welcome margarita. Last year they let us have an extra drink on the way out, this year they did not. They also tell you about the 3 different kinds of tequila, and pair each one with a course of the meal. The food was absolutely awesome. Not sure if they are serving the same food at each lunch, or if it varies. We had a scallop ceviche, a creamy sweet potato soup, pork belly and octopus, and a tres leches cake.
It's a great overall experience, and the food is not necessarily what you think of when you think of Mexican food. If it fits in our schedule, we will return next year as well. Enjoy!