With all the problems my 08 Denali XL has... I can't wait to get rid of it, and it only has 87k. They started all the way back since 36k right after warranty ran out. This 2007-2014 of GMC products is utter crap. From the Body Side Moldings falling off because of cheap tape, to the dash board cracks, to the HVAC control buttons just wearing away (and no replacement buttons only whole assembly!) And the list can go on. I am not happy with this vehicle what so ever. Sadly of all the full size SUVs left on the market these are the only ones who fit the size requirements. The 2015 looks promising, but of course those already had issues before they left the manufacturing plants, so probably more of the same.
If only some Import would make a solid full sized SUV to battle the Suburban/Yukon XL lineup I'd be on it like hotcakes, because this American standard is crap. The closest thing I see would be the Sequoia, but it just pales in comparison of the XLs...
Sigh maybe it just wasn't meant to be.