The main feature of a Yukon Denali XL is its size, which is very comodious. We've taken trips of 400+ miles with six people and all their gear, including Christmas presents, and not filled the cargo area yet. The seats are comfortable with plenty of variation in lumbar and thigh support and lots of legroom. Other very surprising positives are the handling and ride, which are like a luxury passenger car.
Handling and ride
My only changes would be to add a heated steering wheel and air conditioned seats, otherwise it has it all.