Genius to settle and bankrupt at the same time... I bet an accountant/lawyer got a nice bonus for that move.
I have never trusted the stuff, but if you want to change over to a different coolant, you need to thoroughly flush the system first. I drain everything I can, run it on distilled water and drain again a couple times. Good old fashioned "kill the neighbors dog" coolant for me (dog lovers can substitute cat, squirrels, children at will).
Regular change intervals also means a lot. If you don't all of the coolant's can turn acidic and cause grief. Dexcool has its biggest issues from cavitation and when mixed with air gets really bad, ford had an issue like that in their 3.0 taurus from 96 until the end of production... rust stained degas bottles and rusted freeze plugs too.