I purchased this Z71 4WD Avalanche new and have enjoyed excellent reliability. It has always run flawlessly. I usually trade every couple of years due to boredom or a more desirable rig, but I haven't been able to find anything that compares to the ride, performance, and awesome design. People are amazed at how much room it has with the bed fully extended. More than a long bed pickup! I highly recommend the Avalanche to anyone looking for a great all around truck.
I can remove the rear window (it stows neatly in the mid-gate) and get an open air feel. Or lower the mid-gate and haul an 8' couch or sheet of plywood with the tailgate closed.
Better mileage, but it does pretty good for a large vehicle, about 17 MPG average.