I had the chimi with ground beef. It was WONDERFUL. The server was friendly and accommodating. He turned off the fan because we were freezing, and actually suggested the chimi as an alternative after I tried to order a very altered version of the monster burrito.
I'm from Texas, so I'm a little particular about my Mexican food, but I can't think of a bad thing to say about Popo's except that it isn't in Texas! I can't wait to go back!