I purchased a 2020 RST 3.0 about a month ago. So far I love the truck, as my 2018 GMC SLT transmission went out. The 10 speed has been more enjoyable than the six speed. 1,300mi on the truck.
NOTE: Truck did leave my wife and I stranded on I-75 due to turbo. Apparently a clamp was never " Installed " from the factory. That was at 400 miles on the clock.
* No issues sense then.