Our Essy is back in the service dept for new transmission. New 360 cameras and software. New updated exhaust system that doesn't have the common flapper valve chirping, seat TSB, and rip the headliner out to do whatever they have done to several before to help the BOOMING sound pressure issue, which I've never heard of one where this has helped.
Will say this: the 2015 Tahoe rental I'm driving is absolutely the worst booming 2015 SUV have driven yet. It's absolutely terrible! Every little bump in the road radiates through the entire cabin and sounds like a subwoofer in your ears. I have now have driven every single 2015 SUV that GM makes. Every single one I have driven has had this problem to some degree. Some little better than others, some really bad like the new Tahoe I'm currently driving .
With all do respect to Evois. This is not because these are the quietest SUV's produced. There is a serious design flaw with these new trucks! I do agree with your comment about the Lexus LX570. I've been in the car biz for the last 25 years. Was with Lexus for the last 3. (Currently at a Toyota store) the LX is a incredible truck. But good Lord, bring the LX, Landcrusher up to date! Toyota would kill it if they redid these two trucks. The Sequia as well is completely out dated. It's pretty bad when you work for Toyota, and you pull up to work in a GM vehicle.