I have a little over 3000 miles on my LTZ and am really enjoying it. It is one of the most comfortable rides I have owned over the years. Visibility is excellent although changing lanes on the highway and parking do take a little getting used to with this big beast. Definitely splurge on the rear back up camera as I can't imagine parking without it. Fit and finish in the LTZ is great and so far in almost 3 months we have not needed to return to the dealership for anything.
Flexibility for hauling items and gas mileage only slightly worse than most "mid-size" trucks. OnStar pre-paid hands free phone. Super comfortable seating.