Just purchased 2021 Yukon Denali XL that dealer owner used for self for 6 months. Loaded with every option. Had 7k miles on it. Certified.
Glad I bought this way as he likely worked out any kinks and I got a full inspection/oil change etc prior to taking possession.
Just learning how to operate this beast but so far so good. Definitely a massive learning curve to fully utilize the vehicle.