Dexcool is only a problem when air is introduced into the cooling system, or when you have a LIM gasket leak, etc. Dexcool is also the cause of the plastic LIM gasket failure.
From what I understand dexcool was reformulated a few years back (after the lawsuit) and is a different (better) animal now. So dexcool on the store shelves is the good stuff.
Switching coolant from dexcool to conventional is difficult because if you dont get every last drop of dexcool out of your system and install the green, you can turn you cooling system into jelly.
My vote is for dexcool, only because I am going to be running aluminum LIM gaskets.
Edit: Damn bio you beat me by a minute.