This is the 6.6L with the Duramax/Allison combination, not the 6.0L. I previously had an 05' with similar features but wasn't worth the buyout at the end of the lease. There are things I liked about the 05 that the 08 lacks but most of all, I'm very pleased with the truck. Towing is great. Crewcab 8' bed is a long truck though. Park it at home if you intend to go into a city.
Towing and hauling capabilities, large front grille, comfortable leather seats, heated back and seat pads, 6 speed Allison, 33 gallon tank for long trips (MA to NC on a full tank!), OnStar, XM radio and steering wheel controls
Lacks armrest in the seats. Fuel mileage should be better. REGEN drinks the fuel down fast. These bumpers are very thin! Power mirrors and the paint needs improvement