For the most part, my 2001 LS Tahoe has been great. It has always been in the garage, and it's in great condition. I really only have a couple complaints.
I have had the steering column linkage grease twice (about every 35k miles). It will make a clinking noise when you turn, but the GM kit will fix the problem. My gas mileage has never been better than 14-15 mpg, even on long highway trips. We bought a 2WD thinking it would get closer to the 18-19.
I am now having a coolant leak problem that most 5.3L seem to get over time. Not sure if it is the water pump of the intake gasket problem. Time to take her in for a $1000 in repairs.
Also, do not buy the Fortera tires from Goodyear. They claim 60k miles, but you will be lucky to get 30. They ride great and reduce noise, but very expensive for the mileage you get out of them. I am on my second set and they are about gone.
This is a very comfortable car. We bought it new, and now it is just a 3rd car for trips and when we need to haul 7 people or the dog. 3rd row seat is nice to have.
Gas mileage is awful, but to be expected.
I wish the front passenger had more leg room. Seems cramped for a big car.