Finally this thread is getting on the right path. I have a little document that I've been spending a few spare minutes each night writing about this. Still have a number of things to hit on though.
For those who think it is fine to go COP just because a number of people are running it with "no problems" (perceived that is), then I say go ahead and follow the leader. Just do it! Let's just say there are also a number of people running Taurus oil pans with "no problems," yet, I would never run one on any of my cars, nor my clients vehicles (even at their request).... but I'll save that debate for another thread!
Point is, just because something "works," does not mean it is correct. Can RTV seal up a MTX 75 trans case and keep it from leaking? Sure. Is it correct, not at all. Can RTV create a nice seal underneath Bugzuki plates in a 3L swap? Sure, it will work for a LIMITED time. Is it correct? Not at all!
People do things all the time that are not correct, and some actually do get lucky with no issues for awhile. Just because a number of people are running COP does not mean we should all just "splice and play" COP as well.
Let's just keep this thread on track of COP discussion though. I don't want to stir up anything with my oil pan comments in this thread!