Cannot say enough about the power of the 6.6 Duramax, handles grades up and down quite well. The seats are very comfortable, both front and rear; with three kids, it had to be. Not nearly as impressed with the finish as this is the second new GM/Chevy product I have owned in the past 12 years and both were of far less quality finish than the competition. Fortunately for GM/Chevy, it was the heart, not the looks, Shame on GM/Chevy for their lack of quality control on the exterior finish.
The Duramax is transparent to everyone except the driver (lots of power), it is quite quiet which I like as compared to an older diesel I have. The entertainment system and Bose Stereo coupled with the sunroof makes for a fun truck to drive with the kids.
Chevy could do a lot to take a look at their quality control. We're quite disappointed with the finish. A little hard to notice while at the dealer, once home a few items stood out like a sore thumb and are not easily fixed, i.e., fit & finish of the drivers side passenger door. Looks like bad body work.