Hey Stu,
Not all kits require the "Green" bearings. Some kits such as ones available from DrDiff allow the use of the factory Timkens. Also, GREEN is a brand name. There are a few companies that make these non adjustable replacement bearings. I don't know if they all are just as unreliable, but I assume that they would be. They are a BALL bearing with only a fraction of the contact area of the tapered roller bearings from Timken.
My Charger is on the second failing set in 9000 miles. There are some Mopar guys that are totally in love with these POS bearings but I certainly am not one of them.
I prefer corners to drag racing and I have learned that they are terribly inadequate. I have the Dr Diff rear disc kit and plan to return to the stock type bearings soon.