I like it a lot. There's one really convenient to where I work and they're really fast. There's not really anything to recommend; you just pick the things you like. It's "Subway-style" in that you tell them what you're having (bowl, burrito, tacos) and then tell them what you want in it.
I would recommend a burrito or a bowl as the tacos are the same price but you don't get as much food. Also, if you get only veggies and no meat, you get free guacamole!