Full disclosure, I own a small used car lot. I specialize in pre owned Trucks/SUVs. I will tell you, that approx. 50% of my sold inventory consists of 07-09 Tahoes/Yukons/Denali/Escalades. Interestingly enough, as it relates to this "mileage" thread, my sweet spot is really 07-08 models with anywhere between 180k miles to 225k miles. These vehicles drive trains are bullet proof, and are an extremely good bang for the buck vehicle. Im starting to see a ton of 07-08 models with mileage in the 250k + range, and they sell quickly. At auction, there is typically several dealers fighting over/bidding up even these high mileage Tahoes/Yukons. So, not only do they hold up well past 200K miles...there is still a very strong market for them, when the time to sell them comes.
Oh! And every single one I have ever seen has a cracked dash! EVERY SINGLE ONE!!!!!!!