I had a truck with the orange dexcool in it, and in my case I did have some seals get really soft and gooey... So my experience lies in the "avoid it category".
And yeah, be ***REALLY*** careful about what coolants you mix with what, they are not all compatible any more, and It's my understanding that even if they swear up and down to be compatible, you should be careful. I've been running Some blue coolant made by Honda for Honda cars. No problems in two years, locally available and relatively inexpensive.
Whatever you do, I suggest you flush out the system as best as possible and start over with whatever coolant you decide on. (dont mix it in)