Bought one of these in 07 as a program vehicle with 5000 miles. Loved it, but when gas prices went up to over $3.50 we traded in for a Saturn Vue. BIG mistake. Didn't know what we had till it was gone. My wife decided she wanted a big truck again recently. She wanted a truck, but with all the bells and whistles normally found in SUVs (heated seats, DVD, nice interior). Looked at everything out there and fell back to the Avalanche. Bought another 2007 model this year with 44,000 miles and love it, again. Will not sell again, I don't care if gas goes to $10.00 a gallon.
Exterior looks, especially with the 20 inch wheels. Ride comfort. Covered, versatile bed. Every option I can think of is in this truck (LTZ model).
Better gas mileage. More aggressive power and sound. The power is adequate, but I like fast vehicles.