I love them. I have two! An 02' and a new '03.
Both have been extremely trouble free. The nice thing about a Denali is everything is standard, no picking options.
they did change the dash and a lot of the features in '03. I really like the '03 better.
Mine are both XL's, but the vehicle is essentially the same.
I pull my little 28' boat with it at 90+mph all day long.
The Denali has the air leveling suspension, and that is a huge positive!
I do have my '02 for sale (getting a 2500HD w/Duramax for pulling) It has 26,000 miles. White/beige interior. Let me know if you are interested. Truck is flawless.