Not much to add to the other reviews -- a really cool interior with very mediocre food. Even if you don't think Chipotle is that great, you must admit that their food is consistent and the service is extremely efficient. At M4 (or, Chi-faux-tle as my husband calls it) the food is much less flavourful than Chipotle and the people making the food seem to have never interacted with a flour tortilla before. The service is painstakingly slow (but very friendly), and there seems to be no system among workers about who is doing what and at what pace. I will not be going back -- there are other places in the area where you can spend about the same amount of money and get something better and probably faster -- sandwiches, pizza, noodles, etc.