I am very impressed with this truck. It is the Duramax Diesel(LBZ 6.6l) with Allison Transmission. It's solid truck that drives extremely well. It is very quiet for a diesel. My kids actually fall asleep in it when we are on the highway because it is so smooth. Although, this truck has a lot of power! I like the body style but if I could change one thing it would be the tiny tires they put on this hulking truck. It really hurts the overall look of it and most buyers of this truck change them immediately anyways.
My favorite features are the Duramax and Allison. Together they are the best combination on the market
I would replace the tires for larger ones. I also did replace the stock head lamps for HIR lamps because the stock lamps are not very bright.
† Edmunds.com received the highest numerical score in the proprietary J.D. Power 2014 Third-Party Automotive Website Evaluation Study℠. Results based on responses from 3,381 responses, measuring 14 companies and measures third-party automotive website usefulness among new and used vehicle shoppers. Proprietary study results are based on experiences and perceptions of owners surveyed from January 2014. Your experiences may vary. Visit jdpower.com.