Pros
I started off as the "tortilla" position. Which means that you'll greet and receive the customer's orders. Than job position is really easy. If you are shy that experience definitely help you out to overcome any position in the restaurant. You get "free food". You'll get a few cool t-shirts.
Cons
It can get very very busy. At Chipotle, you aren't only in one position. Sometimes you'll have to jump off to help on the grill, prep, salsa or washing dishes. This place demands high availability, energy and TEAMWORK. Depending on the store's management, they can cut your hours. There isn't much room to grow really, unless you pursue a career in the food industry. Kitchen managers and Service Managers' salaries aren't that different. Once you become a Service that it, your life is over.