Hand the waiter a couple bucks when they refill your order, bet they will be all over you after that.
I think I've only eaten there three or four times, for no other reason then there really isn't one near us and it's not in a direction we would drive the 20 or 25 for dinner, there are many other mexican places in between.
I do know people who love the place though.
Given the choice say if I was in a hotel someplace on a business trip, and it was the usual suspects of that price/quality range, I would probably go with On the border over Chili's, TGIF, etc.