The 5.3L engines with the active fuel management in that vintage have some serious oil pump issues. I had a 2006 Envoy Denali that went to the junk yard with just under 100K on the clock after the engine ate its bearings following a single no oil pressure cold start.
Also, the 2006 5.3L is not forward or backward compatible with any other model year 5.3L so finding a replacement engine (if you were to find yourself in a similar situation) is quite difficult, if not impossible (unless you want the roll the dice on a junk yard motor). Having the engine pulled out and rebuilt would have cost more than $9000 at the time (2016) so I cut my losses and sent the Envoy Denali to the junk yard.
I will take the bus before owning another GM vehicle.
There are problems with this model:
1. They're filling the void between owning a fullsize and mid-size. This means they put an engine in a car that wasn't designed for it from the start.(hard to work on, no space for hands to remove a simple alternator, spark plugs, etc). It probably doesn't have the fullsize tranny, transfer case, or rear diff to go with it either...
2. AWD is for people who don't understand the difference. Very few car companies do AWD "correctly". That alone will send these cars to the junk yard. That center differential is $6000 last I checked

3. If this has AFM, GM still hasn't gotten that "right". Even the 2012+ are known for burning oil. This was the second try at AFM. Cadillacs got it first around 1999, then GMC, then Chevy.
I stick with full size Chevy bread and butter. GMC Denali and Cadillac get all the trial tech, then they figure out what to put in the next gen Chevys. They just announced yesterday that Cadillac will be GM's Electric pioneer. The fact remains the same.