Mine has been really reliable. I too heard that 03's were more sorted out than the 02's which is why I bought mine.
Sure little things (window regulators, rear bulbs always burning out, TC in neutral reset, etc) but nothing that has been serious, or that I couldn't fix myself with the help of this forum.
My AC did stop, found out that a rock pierced the condensor - can't fault the car for that. And, every once in awhile it goes into a kind of "limp mode" easily fixed by turning off, removing key, and turning back on again.
Overall - tremendous truck, a keeper.