I bought mine the last day of November last year. It was a 2017 that they were moving out as the 2018s were coming in. I just rolled over to ~24,000 miles, It makes me sick that I drive this much back and forth to work just about every day. Its 108 miles round trip. Thank God I have off every other Friday.
No problems at all with the truck during that time. I sometimes whish I had bought the LTZ Z71 but I did get the ALL Star Package with upgraded electronics, towing and locking rear with 3.42 gears. I also bought a V6. It has been amazing on gas doing that commute and I'm very happy with the performance. This is coming from a guy that has driven Corvette for over 25 years. I'm definitely a Chevy guy for sure. Maybe next year move up to a 2500 Duramax to tow a travel trailer I want.