Dexcool has not caused issues in other cars besides the 60* V6 family and the 3800. Two families of engines known to develop leaky gaskets no matter what coolant you run.
Why doesn't it leak in the Corvette? The Solstice? The Tahoe? The Escalade? Saturns? The list goes on. It is because of faulty gaskets and Dexcool is the scape goat.
This is true. Whenever I need to add coolant, I add the Prestone. But, I haven't been in a rush to flush because my Dexcool isn't giving me any problem because I keep it well maintained. I'm probably a little over half and half between Dexcool and Prestone by now since I did my gaskets.
I have seen that link before, and I've seen gaskets like that on a L67 that had the Dexcool removed after five miles. Those gaskets fail like that, end of story. Not because of Dexcool, but bad design. I refer you back to my argument of why every GM engine doesn't have gasket issues then? The same material was used across the board.