I dont think you will EVER get a final call on DexCool. The reason for that is that it is hotly contested whether or not there is any issues with DexCool or not. So what I offer you is my perspective and opinion on the matter and I'll let you make the ultimate decision.

1. DexCool appears to be unnaturally sensative to air, which results in the goo that you find on your radiator cap and sometimes in the overflow tank.
2. The very design of the 3800 radiator lends itself to trapping air in the cooling system. Therefore, the sensative DexCool is going to nearly always have some goo issue.
3. I resolved the air issue for the most part for my application by using a coolant filter that allowed me to fill the radiator up more completely plus I ditched Dex Cool.
4. Left unnoticed, DexCool, when exposed to air seems to solidify to some extend and gets deposited in your radiator and engine.
5. This 'grit' I believe is responsible for the belief the DexCool 'etches' gaskets and engine parts. Its not DexCool itself, its the grit formation from its exposure to air.

I offer to you the following visual evidence. When I tore down my engine, I found this deposited around the #5 cylinder. I havent pulled off the other head yet to see what may be around the #6 cylinder. Additionally, what you see in the pics is not even half of what it still in the engine







My original experience and failure that was dex cool related was my radiator. It deposited so much grit into the radiator that when I pulled the drain plug, no coolant would come out. I had it professionally flushed twice and still it would not come out of the radiator (and as you see above, didnt even affect what was deposited in the engine that I did not know about until I pulled it apart). I finally installed a coolant filter in an attempt to save my radiator:



Here is the stuff the filter was trapping from being deposited in the radiator. I now know that it was grit that was being broke loose in the engine and the filter was trapping it.



Here is what I gathered after just a week or so in the coolant filter:



So you draw your own conclusions. Some will argue that they have had no problem with Dex Cool so therefore there is no issue with Dex Cool. I submit that unless they have put a coolant filter on there to see what is circulating in the engine or have pulled their engine apart to see if there are any deposits then no such claim can be made. Dex Cool does what it was designed to do; perform as an engine coolant. However, its inherent sensativity to air coupled with the design issue of the 3800 radiator have led me to conclude that product will never see the light of day in any vehicle I own.