I love my truck. It's ultra comfortable, even for several people on long rides (I drove two other adults and my two young sons in car seats on a 9 hour trip and no one complained.) I have the Z71 package, but it still rides much smoother than a truck, and because it sits a little lower I prefer it to the ride of my wife's Tahoe. I love the versatility of this truck. I can pack in my whole family and go buy anything I need at the Home Depot, or haul a load of wood or whatever I want. I love the look of the Avalanche, wonderfully odd styling stands out from the crowd. Haven't had any mechanical problems whatsoever with the truck. Interior is "no frils" but very functional.
Gas mileage is horrendous. Tough to manuever in tight parking areas.