Most of the problems associted with Dex Cool are actually caused by other things such as improper maintenance defective materials /poorly designed gaskets, and air infiltrating the cooling system to name a few. Outside of those issues, the coolant works just fine and was designed for modern engines like yours. I've run Dex Cool in my GM vehicles over the years and have not had any major issues . I keep the level up as needed and properly maintained which is important for any coolant you use.
If there were major issues with this coolant don't you think the dealers/GM would have switched to something different by now?