I own a 2005 XUV v8 with 111,450 miles on it. I have had to replace 11 window regulators, drivers side front, mid gate, and tail gate. Funny thing is GMC says they do not have a problem with these, what with the $450 plus replacement I guess they don't have a problem. I also had to have the air bags replaced at 80,000 miles. I will never buy another GMC or recommend one.
I purchased the Envoy XL (SLT V8) in March 05 and have covered 2800 mi mostly around town. We recently had twins, and now with 4 kids total needed an SUV. I like the quite ride, and have upgraded the rear sway bar for better handling (highly recommended). The V8 has good power and sounds good too, but idles a little rough compared to others. My main concern is with the build quality of the vehicle. The paint job is very poor(Carbon gray) and also I have a warped/distorted windshield. The A/C performance in hot/humid weather is useless below 1500-2000 RPM. MPG is 11-12 around town! These issues will be brought up at the first service. Check out trailvoy.com if you have an Envoy/Trailblazer.
V8 power, air suspension, quiet ride around town, nice dash layout, pretty good seat comfort, handles quite well overall (well worth spending the $200 for a better rear swaybar).
A/C, stereo, suspension settings need tweaking like on the Saab SUV (same basic vehicle), build quality overall needs to be as good as the Japanese cars/trucks if there are to claim "professional grade".
I really enjoy driving the Envoy. I feel the handling is great, and it is very quite inside when the windows are up. The ride is smooth, and love the v8 for acceleration. The only faults on the interior are the clock is too small, and it's hard to get to the cup holder above the gear shift on the console. I love the room in the back, but I wish the seats folded down a bit flatter. I love the idea of the built in air compressor.
The navigation system and of course OnStar.
You should be able to customize the display to show a larger clock.
Best size and options for the money in the Denali XL version. I love it. It's not too big (i.e. Yukon or Expedition), but is large enough to really seat 6 - 7 comfortably (unlike Pathfinder, etc), or to seat 5 (or 6) by using the 3rd row seat down entirely or split, and still have LOTS of room for luggage and baby stuff (like a stroller). Took it for a 1000-mile trip over the weekend. Great ride, not like a truck, very smooth, comfortable, and steady, with lots of power in the V8. Wood trim and leather add a luxury feel. Power and heated seats (driver AND passenger), voice navigation, sunroof, XM radio, Onstar, all add up to "what more could you want"?
Audio navigation, OnStar, and XM radio - once you try them, it's hard not to use them, and will be even harder to give them up.
Wishlist: Power liftgate, power side mirrors, rearview camera/sensor. Need improvement in the cupholder area and storage area for driver and passenger - it's a little cramped, could use some redesign thought.