I drive my dad around a lot because of his age and a few aliments, he is 6'11" and 320 ,,,,,need I say more .
Yes , Even Steven VSC has it good point , but last year she (wife) pulled out onto a road with plenty of space , it was snow and ice covered , he ( the guy behind her ) was going to fast (probably) and my wife could not accelerate because it kept shutting the power down , the truck behind her managed to hit the gravel shoulder and ditch his truck . He was ok , some damage to his truck , but I thank him for avoiding ramming into the wife. It could have easily killed her. From the point the incident happened was about 200 feet from where she pulled out , so there was plenty of time. Another time that happened and she had to take the ditch. It has happened to me too , but I know enough to keep the center dif locked.
VSC is wonderful driving down the hiway when its wet , snow covered , slippery. Other than that it is a safety hazard and can be dangerous. Her Ford Escape with the auto ( kick in 4wd feature ) and a 4high locked feature is much safer in snow and ice conditions IMO , since I've driven both frequently in those conditions.
My personal driving habits in snow are VSC on while highway rural road driving , driving stop and go , pulling out into traffic , with snow , my diff. must be locked for safety reasons .
The ATRAC system is excellent and would not want to be without it at all. The VSC can be very dangerous , but has a very few times where it is useful,IMO. Hence most likely why they now have a switch to disable it.
As far as the Tahoe/Yukon goes , the new ones look nice , but I'd rather buy a 2-3 year old one for less than half the price if a new one.
I do love my 4R a lot , best truck I ever had !!! Best for off road....ect.... Worst downfall is the VSC....without a doubt !! After 2 winters of driving I have yet to see it be an asset.