I've owned my Burnt Orange (okay Sunset Metalic) Z66 for a little over 1 1/2 years now and have about 15,000 miles on it. It rides and handles just fine. And for a big truck the mileage is good. 14-15 mpg city and 17- 18 mgg highway. The popping noise in the front end is a bit disconcerting. But will take it in to my dealer for a fix.
Sun roof, XM radio. Midgate and removable bed cover.
Interior design with more internal storage especially console. And a rear folding seat system that doesn't require me to move the drivers seat so far forward to use. One last thing ... make running boards (not tubes) standard equipment.