First thing, you MUST make a reservation or good luck to you getting in.
Second, it is well worth it! Some of the best guacomole I've ever had. Get a sampler to share so you can try some that you would normally never try. Go out on a limb, it won't break here!
The drinks were great (go for happy hour) and the food was just amazing. I got one of their taquitos (bistec), but I highly recommend ordering their black beans on the side....I'm drooling right now thinking about it! :)